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Author name code: mount
ADS astronomy entries on 2022-09-14
author:"Mount, George" 

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Title: Ozone monitoring instrument flight-model on-ground and
    inflight calibration
Authors: Dobber, Marcel; Dirksen, Ruud; Levelt, Pieternel F.; van den
   Oord, Gijsbertus; Jaross, Glen; Kowalewski, Matt; Mount, George H.;
   Heath, Donald; Hilsenrath, Ernest; Cebula, Richard
2017SPIE10568E..0CD    Altcode:
  The Ozone Monitoring Instrument (OMI) is an ultravioletvisible imaging
  spectrograph that uses two-dimensional CCD detectors to register both
  the spectrum and the swath perpendicular to the flight direction. This
  allows having a 114 degrees wide swath combined with an unprecedented
  small ground pixel (nominally 13 x 24 km<SUP>2</SUP>), which in turn
  enables global daily ground coverage with high spatial resolution. The
  OMI instrument is part of NASA's EOSAURA satellite, which will be
  launched in the second half of 2004. The on-ground calibration of the
  instrument was performed in 2002. This paper presents and discusses
  results for a number of selected topics from the on-ground calibration:
  the radiometric calibration, the spectral calibration and spectral
  slit function calibration. A new method for accurately calibrating
  spectral slit functions, based on an echelle grating optical stimulus,
  is discussed. The in-flight calibration and trend monitoring approach
  and facilities are discussed.

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Title: Status of the Geostationary Spectrograph (GeoSpec) for Earth
    and Atmospheric Science Applications
Authors: Janz, S. J.; Hilsenrath, E.; Mount, G.; Brune, W.; Heath, D.
2004AGUFMSF43A0772J    Altcode:
  GeoSpec will support future satellite mission concepts in the
  Atmospheric Sciences and in Land and Ocean Sciences by providing
  time-resolved measurements of both chemically linked atmospheric trace
  gas concentrations of important molecules such as O3, NO2, CH2O and
  SO2 and at the same time coastal and ocean pollution events, tidal
  effects, and the origin and evolution of aerosol plumes. The instrument
  design concept in development is a dual spectrograph covering the
  UV/VIS wavelength region of 310-500 nm and the VIS/NIR wavelength
  region of 480-940 nm coupled to all reflective telescope and high
  sensitivity PIN/CMOS area detectors. The goal of the project is to
  demonstrate a system capable of making moderate spatial resolution
  (1 km at nadir) hyperspectral measurements (1.0 to 1.5 nm resolution)
  from a geostationary orbit. This will enable studies of time-varying
  pollution and coastal change processes with a temporal resolution of
  15 minutes on a regional scale to 1 hour on a continental scale. Other
  spatial and temporal resolutions can be supported by varying the focal
  length of the input telescope and scanning strategies. Scientific
  rationale and instrument design and status will be presented.

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Title: Ozone Monitoring Instrument flight-model on-ground and
    in-flight calibration
Authors: Dobber, Marcel; Dirksen, Ruud; Levelt, Pieternel F.; van den
   Oord, Gijsbertus; Jaross, Glen; Kowalewski, Matt; Mount, George H.;
   Heath, Donald; Hilsenrath, Ernest; Cebula, Richard
2004ESASP.554...89D    Altcode: 2004icso.conf...89D
  The Ozone Monitoring Instrument (OMI) is an ultraviolet-visible imaging
  spectrograph that uses two-dimensional CCD detectors to register both
  the spectrum and the swath perpendicular to the flight direction. This
  allows having a 114 degrees wide swath combined with an unprecedented
  small ground pixel (nominally 13×24 km<SUP>2</SUP>), which in turn
  enables global daily ground coverage with high spatial resolution. The
  OMI instrument is part of NASA's EOS-AURA satellite, which will be
  launched in the second half of 2004. The on-ground calibration of the
  instrument was performed in 2002. This paper presents and discusses
  results for a number of selected topics from the on-ground calibration:
  the radiometric calibration, the spectral calibration and spectral
  slit function calibration. A new method for accurately calibrating
  spectral slit functions, based on an echelle grating optical stimulus,
  is discussed. The in-flight calibration and trend monitoring approach
  and facilities are discussed.

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Title: Status of the geostationary spectrograph (GeoSpec) for earth
    and atmospheric science applications
Authors: Janz, S.; Hilsenrath, E.; Mount, G.; Brune, W.; Heath, D.
2004cosp...35.4385J    Altcode: 2004cosp.meet.4385J
  GeoSpec will support future satellite mission concepts in the
  Atmospheric Sciences and in Land and Ocean Sciences by providing
  time-resolved measurements of both chemically linked atmospheric trace
  gas concentrations of important molecules such as O_3, NO_2, CH_2O
  and SO_2 and at the same time coastal and ocean pollution events,
  tidal effects, and the origin and evolution of aerosol plumes. The
  instrument design concept in development is a dual spectrograph
  covering the UV/VIS wavelength region of 310-500 nm and the VIS/NIR
  wavelength region of 480-900 nm coupled to all reflective telescope and
  high sensitivity PIN/CMOS area detector. The goal of the project is to
  demonstrate a system capable of making moderate spatial resolution (750
  meters at nadir) hyperspectral measurements (0.6 to 1.2 nm resolution)
  from a geostationary orbit. This would enable studies of time-varying
  pollution and coastal change processes with a temporal resolution of
  5 minutes on a regional scale to 1 hour on a continental scale. Other
  spatial resolutions can be supported by varying the focal length of
  the input telescope. Scientific rationale and instrument design and
  status will be presented.

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Title: Middle Atmosphere High Resolution Spectrograph Investigation
Authors: Conway, Robert R.; Stevens, Michael H.; Brown, Charles M.;
   Cardon, Joel G.; Zasadil, Scott E.; Mount, George H.
1999JGR...10416327C    Altcode:
  The Middle Atmosphere High Resolution Spectrograph Investigation
  (MAHRSI) was developed specifically to measure the vertical density
  profiles of hydroxyl (OH) and nitric oxide (NO) in the middle
  atmosphere from space. MAHRSI was launched on its first flight in
  November 1994 on the CRISTA-SPAS satellite that was deployed and
  retrieved by the space shuttle. The instrument measured the radiance
  profiles of ultraviolet solar resonance fluorescence on the Earth's
  limb with a spectral resolving power of 15,600 at a wavelength of
  308 nm and 7200 at 215 nm. The instantaneous height of the field of
  view projected to the tangent point was about 300 m. OH limb radiance
  measurements were made between altitudes of 90 and 30 km, and each
  limb scan extended over a horizontal distance of 1200 km. For NO a limb
  scan extended between altitudes of 140 and 76 km and over a horizontal
  distance 700 km. Observations were made from 52°S latitude to 62°N
  latitude. The OH measurements have been inverted to provide the first
  global maps of the vertical distribution of OH between 90 and 50 km. The
  data show a detailed history of the morning formation of a strongly
  peaked layer of OH at an altitude of 68 km. This layer was produced
  by solar photodissociation of a thin layer of water vapor peaked at
  65 km extending between 30°S and 35°N observed contemporaneously
  by the Halogen Occultation Experiment (HALOE) on the Upper Atmosphere
  Research Satellite. MAHRSI was successfully flown for a second time in
  August 1997 under conditions that extended the geographical coverage
  to 72°N latitude and local solar time coverage through the afternoon
  hours. This paper provides a detailed description of the experiment
  and instrumentation, of the algorithms used to reduce the spectral
  data and perform the inversions, and presents examples of key results
  from the 1994 flight.

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Title: Solar Spectral Irradiance Measuremetns: Visible to
    Near-Infrared Regions
Authors: Rottman, G.; Mount, G.; Lawrence, G.; Woods, T.; Harder,
   J.; Tournois, S.
1998Metro..35..707R    Altcode:
  No abstract at ADS

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Title: Satellite measurements of hydroxyl in the mesosphere
Authors: Conway, Robert R.; Stevens, Michael H.; Cardon, Joel G.;
   Zasadil, Scott E.; Brown, Charles M.; Morrill, Jeff S.; Mount,
   George H.
1996GeoRL..23.2093C    Altcode:
  The global distribution of hydroxyl (OH) in the middle atmosphere was
  recently measured by the Middle Atmosphere High Resolution Spectrograph
  Investigation (MAHRSI) on a satellite deployed and retrieved by the
  space shuttle. During 75 orbits, MAHRSI acquired 1800 daytime limb scans
  of the OH ultraviolet solar resonance fluorescence intensity. Each limb
  scan extends over the altitude region from 30 to 90 km and across 10°
  of latitude between 53°S and 63°N. OH number densities were retrieved
  using a Twomey regularization scheme constrained by the smoothness
  of the retrieved profile. Results provide a detailed description of
  the diurnal variation of mesospheric OH. Midmorning OH densities had a
  well defined peak of about 6 ×10<SUP>6</SUP> cm³ near 70 km, a broad
  minimum centered near 64 km, and rose to about 1 × 10<SUP>7</SUP>
  cm³ at 50 km. This profile is in substantial disagreement with
  photochemical model predictions [Summers et al., this issue]. The
  observations are compared with the two previous measurements.

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Title: Visible and near-ultraviolet spectroscopy at McMurdo Station,
    Antarctica. VIII - Observations of nighttime NO2 and NO3 from April
    to October 1991
Authors: Solomon, S.; Smith, J. P.; Sanders, R. W.; Perliski, L.;
   Miller, H. L.; Mount, G. H.; Keys, J. G.; Schmeltekopf, A. L.
1993JGR....98..993S    Altcode:
  Lunar absorption spectra have been used to determine the vertical column
  abundances of NO2 and NO3 above McMurdo Station, Antarctica, during
  the fall, winter, and spring seasons in 1991. The observed nighttime
  NO2 and NO3 amounts during the fall and spring were broadly consistent
  with model predictions and with daytime measurements. During winter,
  local photochemistry would imply a long polar night, with associated
  gradual removal of NO2 and buildup of NO3 and N2O5. The winter
  observations of both species differ from such simple predictions by
  factors greater than 10, with the measured NO2 being far larger than
  predicted, while the measured NO3 is much smaller than predicted. The
  concurrent measurements of both NO2 and NO3 strongly constrain possible
  solutions for these discrepancies and suggest that air parcel excursions
  to sunlit, lower latitudes likely take place quite regularly throughout
  the winter (approximately every 3-7 days).

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Title: An Intercomparison of Tropospheric OH Measurements at Fritz
    Peak Observatory, Colorado
Authors: Mount, George H.; Eisele, Fred L.
1992Sci...256.1187M    Altcode:
  The hydroxyl radical (OH) controls the lifetimes and therefore
  the concentrations of many important chemical species in Earth's
  lower atmosphere including several greenhouse and ozone-depleting
  species. Two completely different measurement techniques were used in an
  informal intercomparison to determine tropospheric OH concentrations at
  Fritz Peak Observatory, Colorado, from 15 July to 24 August 1991. One
  technique determined OH concentrations by chemical analysis; the other
  used spectroscopic absorption on a long path. The intercomparison
  showed that ambient OH concentrations can now be measured with
  sufficient sensitivity to provide a test for photochemical models,
  with the derived OH concentrations agreeing well under both polluted
  and clean atmospheric conditions. Concentrations of OH on all days
  were significantly lower than model predictions, perhaps indicating the
  presence of an unknown scavenger. The change in OH concentration from
  early morning to noon on a clear day was found to be only a factor of 2.

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Title: Interference effects in reticon photodiode array detectors
Authors: Mount, George H.; Sanders, Ryan W.; Brault, James W.
1992ApOpt..31..851M    Altcode:
  A detector system incorporating the Reticon RL1024S photodiode array
  has been constructed as part of a double spectrograph to be used to
  study the earth's atmosphere from ground-based and aircraft-based
  platforms. To determine accurately the abundances of atmospheric trace
  gases, this new system must be able to measure spectral absorptions as
  small as 0.02 percent. The detector exhibits superior signal-to-noise
  characteristics at the light levels characteristic of scattered
  skylights, but interference in the passivating layer causes problems
  in achieving the required precision. The mechanism of the problems
  and the solution implemented are described in detail.

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Title: New spectroscopic instrumentation for measurement of
    stratospheric trace species by remote sensing of scattered skylight
Authors: Mount, George H.; Jakoubek, R. O.; Sanders, R. W.; Harder,
   J. W.; Solomon, S.; Winkler, R.; Thompson, T.; Harrop, W.
1991SPIE.1491..188M    Altcode:
  Instrumentation under construction and testing at the NOAA Aeronomy
  Laboratory for conducting measurements of the zenith sky and the
  moon in order to measure molecular abundances of trace gases in the
  stratosphere at extremely low levels of absorption (less than 0.05
  percent) is discussed. The instrumentation consists of a telescope (for
  lunar observation at night or direct sun during the day), a light feed,
  a spectrograph, an array detector, and a data analysis system. The
  telescope design is a dual off-axis parabolic feed with polarizers,
  depolarizers, image rotators, and other optical modifiers that can
  be inserted at the feed focus to test their effect on the residual
  spectrum. The spectrograph is a cast aluminum 3/8-m f/6 double crossed
  Czerny-Turner system.

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Title: Long path differential absorption measurements of tropospheric
    molecules
Authors: Harder, Jerald; Mount, George
1991SPIE.1491...33H    Altcode:
  The measurement of the important atmospheric molecules O3, NO2,
  CH2O, H2O, NO3, and HONO can be measured using long path differential
  absorption spectroscopy. The experiment is located at the Fritz Peak
  Observatory, 17 km west of Boulder, Colorado. This site permits both
  the measurement of clean continental air during times of westerly
  air flow, as well as polluted urban air during easterly up-slope
  episodes. The spectrograph used in this study is a low resolution double
  crossed Czerny-Turner, with a well matched receiving telescope. This
  spectrograph uses a 1 x 1024 element Reticon diode array detector to
  measure the molecular absorption spectra of these molecules in 40 nm
  bands in the near ultraviolet-visible region. The total optical path
  for this experiment is 20.6 km, and the path is folded by a 121 element
  retroreflector array thereby allowing the light source and spectrograph
  to be in the same location. Deduction of atmospheric concentrations
  these molecules over this path is accomplished by using a least squares
  procedure that employs the method of singular-value decomposition.

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Title: Atmospheric NO3. II - Observations in polar regions
Authors: Solomon, S.; Sanders, R. W.; Mount, G. H.; Carroll, M. A.;
   Jakoubek, R. O.
1989JGR....9416423S    Altcode:
  Stratospheric NO3 is expected to depend strongly upon two major factors:
  solar illumination and temperature. This paper presents observations
  in the polar regions that confirm the influence of both of these on
  the NO3 column abundance. Measurements of the absorption of incoming
  lunar radiation near 662 nm as the sun rises exhibit large changes
  that apparently reflect the rapid photolysis of NO3. The increase in
  upper stratospheric temperature that occurs in early spring in polar
  regions should also affect the seasonal changes in stratospheric NO3
  abundances. Observations of stratospheric NO3 at 76.5 deg N in early
  February are contrasted with those obtained at 77.8 deg S in late
  August and September. Large seasonal differences in stratospheric
  temperatures between these two locations and times are shown to be in
  excellent agreement with the observed NO3 column amounts, providing
  further support for current understanding of the factors controlling
  the stratospheric NO3 abundance and its variability. These findings
  provide further evidence against a stratospheric 'scavenger' for NO3,
  even in polar latitudes, where the scavenging effect was believed to
  be most pronounced.

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Title: Remote sensing observations of nighttime OClO column during
    the Airborne Antarctic Ozone Experiment, September 8, 1987
Authors: Wahner, A.; Jakoubek, R. O.; Mount, G. H.; Ravishankara,
   A. R.; Schmeltekopf, A. L.
1989JGR....9411405W    Altcode:
  The daytime and nighttime slant column abundances of OClO were measured
  by near-UV absorption spectroscopy between 64 and 76 deg S latitude
  and 62 and 84 deg W longitude during the DC-8 flight on days 251 and
  252 (UT) 1987 as a part of the Airborne Antarctic Ozone Experiment
  (AAOE). Daytime and nighttime measurements used the scattered sunlight
  and the moon as the light sources, respectively. The measured OClO
  column abundance during the nighttime was found to be 10 times larger
  than that measured during the day.

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Title: Observations of the Nighttime Abundance of OClO in the Winter
    Stratosphere above Thule, Greenland
Authors: Solomon, S.; Mount, G. H.; Sanders, R. W.; Jakoubek, R. O.;
   Schmeltekopf, A. L.
1988Sci...242..550S    Altcode:
  Observations at Thule, Greenland, that made use of direct light
  from the moon on 2, 3, 4, 5, and 7 February 1988 revealed nighttime
  chlorine dioxide (OClO) abundances that were less than those obtained in
  Antarctica by about a factor of 5, but that exceeded model predictions
  based on homogeneous (gas-phase) photochemistry by about a factor of
  10. The observed time scale for the formation of OClO after sunset
  strongly supports the current understanding of the diurnal chemistry
  of OClO. These data suggest that heterogeneous (surface) reactions
  due to polar stratospheric clouds can occur in the Arctic, providing
  a mechanism for possible Arctic ozone depletion.

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Title: Observations of Stratospheric NO<SUB>2</SUB> and O<SUB>3</SUB>
    at Thule, Greenland
Authors: Mount, G. H.; Solomon, S.; Sanders, R. W.; Jakoubek, R. O.;
   Schmeltekopf, A. L.
1988Sci...242..555M    Altcode:
  Scattered sunlight and direct light from the moon was used in
  two wavelength ranges to measure the total column abundances
  of stratospheric ozone (O<SUB>3</SUB>) and nitrogen dioxide
  (NO<SUB>2</SUB>) at Thule, Greenland (76.5 degrees N), during the
  period from 29 January to 16 February 1988. The observed O<SUB>3</SUB>
  column varied between about 325 and 400 Dobson units, and the lower
  values were observed when the center of the Arctic polar vortex was
  closest to Thule. This gradient probably indicates that O<SUB>3</SUB>
  levels decrease due to dynamical processes near the center of the
  Arctic vortex and should be considered in attempts to derive trends
  in O<SUB>3</SUB> levels. The observed NO<SUB>2</SUB> levels were also
  lowest in the center of the Arctic vortex and were sometimes as low
  as 5 × 10<SUP>14</SUP> molecules per square centimeter, which is
  even less than comparable values measured during Antarctic spring,
  suggesting that significant heterogeneous photochemistry takes place
  during the Arctic winter as it does in the Antarctic.

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Title: Middle atmosphere high resolution spectrograph
Authors: Conway, R. R.; Prinz, D. K.; Mount, G. H.
1988SPIE..932...50C    Altcode:
  The U.S. Naval Research laboratory's middle atmosphere high-resolution
  spectrograph (MAHRS), part of the Air Force Test Program's Spartan-282
  shuttle payload, is described. The goals of the MAHRS experiment are
  to determine the abundances of nitric oxide and hydroxyl radical in
  the altitude range of 50-150 km and to measure the diurnal global
  variation of these species. The MAHRS instrument was designed to
  produce a flat image at the surface of a 15-mm high x 25-mm wide
  microchannel-plate-intensified two-dimensional array detector with a
  cesium telluride photocathode and a 0.025 mm spatial resolution.

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Title: Visible spectroscopy at McMurdo station, Antarctica. III -
    Observations of NO3
Authors: Sanders, R. W.; Solomon, S.; Mount, G. H.; Schmeltekopf,
   A. L.; Bates, M. W.
1987JGR....92.8339S    Altcode:
  The total column abundance of NO3 was measured in Antarctica during
  the nights of Sept. 17-19, 1986, by visible absorption, using the
  moon as the light source. The variation of the observed abundance with
  lunar zenith angle suggests that the bulk of the layer is located in
  the stratosphere. In agreement with theoretical model calculations,
  the total column was about 2.0 x 10 to the 13th molecule/sq cm and
  increased systematically with time during the night.

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Title: Solar absolute spectral irradiance 118-300 nm: July 25, 1983
Authors: Mount, G. H.; Rottman, G. J.
1985JGR....9013031M    Altcode:
  The full-disk solar absolute spectral irradiance in the spectral
  range 118-300 nm was obtained from a rocket observation above White
  Sands Missile Range, New Mexico, on July 25, 1983, halfway in time
  between solar maximum and solar minimum. Comparison with measurements
  made in May 1982 shows no changes within the absolute errors of the
  experiment. Comparison with measurements made during solar maximum
  in 1979 and 1980 indicates a large decrease in the absolute solar
  irradiance at wavelengths below 190 nm. The absolute calibration of
  the instruments for this flight was accomplished at the National Bureau
  of Standards Synchrotron Radiation Facility.

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Title: Solar Mesosphere Explorer ultraviolet Spectrometer Measurements
    of ozone in the 1.0-0.1 mbar region
Authors: Rusch, D. W.; Barth, C. A.; Thomas, R. J.; Callan, M. T.;
   Mount, G. H.
1984JGR....8911677R    Altcode:
  The ozone density of the earth's mesosphere in the 1.0-0.1 mbar (48
  to 70 km) region has been measured at sunlit latitudes for the period
  from December 1981 until the present by an ultraviolet spectrometer
  on the Solar Mesosphere Explorer satellite. Results for 1982 are
  reported. The ozone mixing ratios are found to be highly variable in
  time and place, with maxima occurring in the winter hemispheres. The
  results show complex time variations at all pressure levels, with annual
  and semiannual variations apparent at most pressures and latitudes. A
  relative maximum occurs in July at the equator.

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Title: Measurements of stratospheric NO2 from the Solar Mesosphere
    Explorer satellite. II - General morphology of observed NO2 and
    derived (N2)O5
Authors: Solomon, S.; Mount, G. H.; Zawodny, J. M.
1984JGR....89.7317S    Altcode:
  Observations of NO<SUB>2</SUB> densities from 28 to 40 km as measured
  by the Solar Mesosphere Explorer (SME) satellite are compared to model
  calculations for the month of January. Low densities are obtained in
  the tropics and in high latitude winter, with much larger values in the
  summer middle and high latitude regions in both the observations and the
  model. The reasons for areas of agreement and disagreement between the
  model and the observations are explored. The observed NO<SUB>2</SUB>
  distribution is also used to infer the N<SUB>2</SUB>O<SUB>5</SUB>
  distribution based on presently accepted chemistry and suggests that
  very large amounts of N<SUB>2</SUB>O<SUB>5</SUB> are present in high
  latitude winter.

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Title: The Solar Absolute Spectral Irradiance at 1216 Å and 1800-3173
Å: January 12, 1983
Authors: Mount, G. H.; Rottman, G. J.
1983JGR....88.6807M    Altcode:
  The full-disk solar spectral irradiance in the spectral range 1800-3173
  Å and at Ly α was obtained from a rocket observation above White
  Sands Missile Range, New Mexico, on January 12,1983. Comparison with
  measurements made in May 1983 show no changes within the absolute
  errors of the experiment. The absolute calibration of the instruments
  for this flight was accomplished at the National Bureau of Standards
  Synchrotron Radiation Facility.

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Title: The solar absolute spectral irradiance 1150 - 3173 Å: May
    17, 1982.
Authors: Mount, G. H.; Rottman, G. J.
1983JGR....88.5403M    Altcode:
  The full-disk solar spectral irradiance in the spectral range 1150-3173
  A was obtained from a rocket observation above White Sands Missile
  Range, NM, on May 17, 1982, half way in time between solar maximum and
  solar minimum. Comparison with measurements made during solar maximum
  in 1980 indicate a large decrease in the absolute solar irradiance
  at wavelengths below 1900 A to approximately solar minimum values. No
  change above 1900 A from solar maximum to this flight was observed to
  within the errors of the measurements. Irradiance values lower than
  the Broadfoot results in the 2100-2500 A spectral range are found,
  but excellent agreement with Broadfoot between 2500 and 3173 A is
  found. The absolute calibration of the instruments for this flight was
  accomplished at the National Bureau of Standards Synchrotron Radiation
  Facility which significantly improves calibration of solar measurements
  made in this spectral region.

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Title: Ozone densities in the lower mesosphere measured by a limb
    scanning ultraviolet spectrometer
Authors: Rusch, D. W.; Mount, G. H.; Barth, C. A.; Rottman, G. J.;
   Thomas, R. J.; Thomas, G. E.; Sanders, R. W.; Lawrence, G. M.; Eckman,
   R. S.
1983GeoRL..10..241R    Altcode:
  The ozone content of the earth's atmosphere between 1 mb and 0.08 mb has
  been measured as a function of latitude and season by an ultraviolet
  spectrometer on the Solar Mesosphere Explorer spacecraft. The ozone
  mixing ratio is found to be highly variable in time and space during
  the winter of 1982 with maxima occuring in the winter hemisphere during
  January and February at all pressure levels. The latitude gradients
  near spring equinox are relatively small. A relative maximum occurs
  at latitudes between 15 and 30°S in January and February.

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Title: Ozone density distribution in the mesosphere (50-90 km)
    measured by the SME limb scanning near infrared spectrometer
Authors: Thomas, R. J.; Barth, C. A.; Rottman, G. J.; Rusch, D. W.;
   Mount, G. H.; Lawrence, G. M.; Sanders, R. W.; Thomas, G. E.; Clemens,
   L. E.
1983GeoRL..10..245T    Altcode:
  The ozone densities between 50 and 90 km are deduced from 1.27 µm
  airglow measured on the Solar Mesosphere Explorer satellite. The
  derived densities agree well with those made simultaneously from
  SME by the ultraviolet spectrometer. The data set extends from pole
  to pole at about 3 pm, for most sunlit latitudes. At low altitudes,
  in the mesosphere, there are larger variations in ozone density in
  the winter latitudes than in the summer. Above the meso-pause the
  day-to-day variation in ozone density is a factor of two at most
  latitudes and times.

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Title: Temperature measurements in the Earth's stratosphere using
    a limb scanning visible light spectrometer
Authors: Rusch, D. W.; Mount, G. H.; Zawodny, J. M.; Barth, C. A.;
   Rottman, G. J.; Thomas, R. J.; Thomas, G. E.; Sanders, R. W.; Lawrence,
   G. M.
1983GeoRL..10..261R    Altcode:
  The temperature of the earth's atmosphere between 40 and 50 km
  is inferred from measurements of Rayleigh scattered sunlight by
  a visible-light spectrometer on the Solar Mesosphere Explorer
  spacecraft. The RMS deviation of the satellite measurements from
  conventional rocket measurements is 5°K above 45 km and 2-3°K below
  45 km. The satellite data are compared to model temperatures for
  March, 1982.

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Title: Solar Mesosphere Explorer: Scientific objectives and results
Authors: Barth, C. A.; Rusch, D. W.; Thomas, R. J.; Mount, G. H.;
   Rottman, G. J.; Thomas, G. E.; Sanders, R. W.; Lawrence, G. M.
1983GeoRL..10..237B    Altcode:
  Instruments on the Solar Mesosphere Explorer simultaneously measure
  ozone density, temperature, and solar ultraviolet flux. Results
  from six months of observations show that ozone density in the
  mesosphere changes from day-to-day and with the seasons and that
  the principal cause of these changes is the variation in atmospheric
  temperature. The dependence between ozone density and temperature is
  inverse, with a decrease in temperature producing an increase in ozone
  density. This dependence is observable in the seasonal patterns and
  also in orbit-to-orbit observations during dramatic atmosphere changes
  such as stratospheric warmings.

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Title: Mesospheric ozone depletion during the Solar Proton Event of
    July 13, 1982 Part I Measurement
Authors: Thomas, R. J.; Barth, C. A.; Rottman, G. J.; Rusch, D. W.;
   Mount, G. H.; Lawrence, G. M.; Sanders, R. W.; Thomas, G. E.; Clemens,
   L. E.
1983GeoRL..10..253T    Altcode:
  The near infrared spectrometer and the ultraviolet spectrometer on
  the Solar Mesosphere Explorer (SME) observed the ozone density as
  a function of latitude and altitude during the solar proton event
  of July 13, 1982. Airglow at 1.27 µm was observed at the earth's
  limb. The altitude profiles of the emission were inverted providing
  ozone densities. The ozone densities observed showed a clear decrease
  during the event. The maximum depletion seen was 70%. The decrease was
  observed in the northern high latitudes at mesospheric altitudes. The
  decrease was very short lived, lasting less than a day.

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Title: Measurements of NO<SUB>2</SUB> in the Earth's stratosphere
    using a limb scanning visible light spectrometer
Authors: Mount, G. H.; Rusch, D. W.; Zawodny, J. M.; Noxon, J. F.;
   Barth, C. A.; Rottman, G. J.; Thomas, R. J.; Thomas, G. E.; Sanders,
   R. W.; Lawrence, G. M.
1983GeoRL..10..265M    Altcode:
  NO<SUB>2</SUB> densities determined from the limb scanning visible
  light spectrometer on board the Solar Mesosphere Explorer spacecraft
  are reported for winter 1981/82 in the altitude region 28-40 km. The
  observational technique utilizes the photoabsorption by NO<SUB>2</SUB>
  of Rayleigh scattered sunlight in the 440nm spectral region. The
  NO<SUB>2</SUB> density varies from pole to pole and shows large
  variations at high northern latitudes during the winter months which
  are related to both the temperature and flow of air near 30 km.

---------------------------------------------------------
Title: Solar mesosphere Explorer measurements of the El Chichon
    volcanic cloud
Authors: Barth, C. A.; Sanders, R. W.; Thomas, G. E.; Rottman, G. J.;
   Rusch, D. W.; Thomas, R. J.; Mount, G. H.; Lawrence, G. M.; Zawodny,
   J. M.; West, R. A.
1982BAMS...63.1314B    Altcode: 1982AMSBu..63.1314B
  After quenching from a temperature above 900°C the structure of
  Kh20N73YuM alloy is supersaturated solid solution. Recrystallization
  temperature for the alloy is 900°C, and alloy structure in relation to
  melting method is characterized by a different volume recrystallized
  matrix which is caused by the degree of prior deformation and metal
  purity.

---------------------------------------------------------
Title: Solar spectral irradiance, 120 to 190nm, October 13, 1981 -
    January 3, 1982
Authors: Rottman, G. J.; Barth, C. A.; Thomas, R. J.; Mount, G. H.;
   Lawrence, G. M.; Rusch, D. W.; Sanders, R. W.; Thomas, G. E.;
   London, J.
1982GeoRL...9..587R    Altcode:
  Beginning on October 13, 1981 a two channel spectrometer aboard the
  Solar Mesosphere Explorer has been obtaining daily measurements of full
  disc solar irradiance. These observations cover the spectral interval
  120 to 305nm with ∽ .75nm spectral resolution. The relative accuracy
  of the measurements from day to day over the first three solar rotations
  is approximately 1%. In this report we present analyses of Lyman-alpha,
  the integrated Schumann-Runge continuum (130-175nm), and the integrated
  Schumann-Runge bands (175 to 190nm). All three show a clear variability
  related primarily to the 27-day solar rotation period. Correlations
  of these three values of solar irradiance to ground-based indices of
  solar activity, 10.7cm flux and sunspot number, are presented.

---------------------------------------------------------
Title: The solar spectral irradiance 1200-3184 Å near solar maximum:
    July 15, 1980
Authors: Mount, G. H.; Rottman, G. J.
1981JGR....86.9193M    Altcode:
  Full-disk solar spectral irradiances near solar maximum were obtained
  in the spectral range 1200-3184 Å at a spectral resolution of
  approximately 1 Å from rocket observations above White Sands Missile
  Range, New Mexico, on July 15, 1980. Comparison with measurements
  made in 1979 and during solar minimum confirms a large increase at
  solar maximum in the solar irradiance near 1200 Å with no change
  within our measurement errors near 2000 Å. Irradiances in the range
  1900-2100 Å are in excellent agreement with previous measurements,
  and those in the 2100- to 2500-Å range are lower than the Broadfoot
  results. We find agreement with previous values 2600-2900 Å and then
  fall below those values 2900-3184 Å.

---------------------------------------------------------
Title: Multi-anode microchannel arrays.
Authors: Timothy, J. G.; Mount, G. H.; Bybee, R. L.
1981ITNS...28..689T    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: The solar spectral irradiance 1200-2550 Å at solar maximum
Authors: Mount, G. H.; Rottman, G. J.; Timothy, J. G.
1980JGR....85.4271M    Altcode:
  Full-disk solar solar spectral irradiances at solar maximum were
  obtained in the spectral range 1200-2550 Å at a spectral resolution
  of approximately 1 Å from rocket observations above White Sands,
  New Mexico, on June 5, 1979. Comparison with measurements made near
  solar minimum indicates approximately a factor of 2.5 increase in the
  irradiance at 1200 Å, a 20% increase near 1800 Å, and no increase
  within our measurement errors (+/-15%) above 2100 Å. Irradiances
  in the range 1800-2100 Å are in excellent agreement with previous
  measurements, but those in the 2100- to 2550-Å range are significantly
  lower. The intensities of strong emission lines at wavelengths below
  1850 Å are also reported.

---------------------------------------------------------
Title: The solar spectral irradiance 1200-3184 a near solar maximum,
    15 July 1980
Authors: Mount, G. H.; Rottman, G. J.
1980STIN...8132107M    Altcode:
  Full disk solar spectral irradiances near solar maximum were obtained
  in the spectral range 1200 to 3184 A at a spectral resolution of
  approximately 1 A from rocket observations above White Sands Missile
  Range. Comparison with measurements made during solar minimum confirm
  a large increase at solar maximum in the solar irradiance near 1200 A
  with no change within the measurement errors near 2000 A. Irradiances
  in the range 1900 to 2100 A are in excellent agreement with previous
  measurements, and those in the 2100 to 2500 A range are lower than
  separate previous results in this range. Agreement is found with
  previous values 2500 to 2900 A A, and then fall below those values
  2900 to 3184 A.

---------------------------------------------------------
Title: The Multi-Anode Microchannel Array Detector System
Authors: Timothy, J.; Mount, G.; Bybee, R.
1980oits.conf..733T    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: Scientific objectives of the Solar Mesosphere Explorer mission
Authors: Thomas, G. E.; Barth, C. A.; Hansen, E. R.; Hord, C. W.;
   Lawrence, G. M.; Mount, G. H.; Rottman, G. J.; Rusch, D. W.; Stewart,
   A. I.; Thomas, R. J.
1980PApGe.118..591T    Altcode:
  The paper describes the NASA Solar Mesosphere Explorer mission which
  will study mesospheric ozone and the processes which form and destroy
  it, measure the ozone density and its altitude distribution from 30 to
  80 km, monitor incoming solar UV radiation, and provide a rigorous
  test of the photochemical equilibrium theory of the mesospheric
  oxygen-hydrogen system. Five instruments will be carried on the
  polar-orbiting spacecraft: UV ozone, IR airglow, and visible NO2
  programmable Ebert-Fastie spectrometers, a four-channel IR radiometer,
  and a solar UV spectrometer. Atmospheric measurements will be made of
  the mesospheric and stratospheric ozone density distribution, water
  vapor density distribution, temperature profile, ozone photolysis rate,
  and NO2 density distribution. In addition, the solar UV monitor will
  measure both the 0.2-0.31 micron spectral region and the Lyman-alpha
  (0.1216 micron) contribution to the solar irradiance.

---------------------------------------------------------
Title: Spatially Resolved Line Profiles of O III and He II in NGC-7662
    and-7009 with the SPIFT-MAMA
Authors: Smith, W. H.; Timothy, G.; Mount, G.; Snow, T. B.
1979BAAS...11..626S    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: Vacuum ultraviolet spectrophotometry and effective temperatures
    of hot stars.
Authors: Brune, W. H.; Mount, G. H.; Feldman, P. D.
1979ApJ...227..884B    Altcode:
  Absolutely calibrated ultraviolet stellar spectra from 3100 A to the
  hydrogen absorption edge at 912 A were obtained on 1977 February 17
  by rocket observations above Woomera, Australia. Spectra taken at 15
  A resolution have been compared with the observed fluxes from OAO 2
  and with recent model-atmosphere fluxes of Kurucz for five hot stars:
  Gamma (2) Vel, Zeta Pup, Alpha Eri, Beta Cen, and Alpha Vir. The
  present data give fluxes which are generally lower than those obtained
  from OAO 2, with the largest deviations of about 20% between 1400 and
  1700 A. Agreement with the models is good, although the model fluxes
  are substantially larger than the observed values below 1200 A. This
  discrepancy is greater for the higher-temperature stars. Effective
  temperatures are also determined and are in good agreement with
  previous results.

---------------------------------------------------------
Title: The Status of the Multi-Anode Microchannel Arrays (MAMA)
    Detector Development Program
Authors: Gethyn, Timothy J.; Mount, George H.
1979SPIE..172..199G    Altcode:
  The Multi-anode Microchannel Arrays (MAMA's) are a family of
  photoelectric photon-counting array detectors being developed for use
  in instruments on both ground-based and space-borne telescopes. MAMA
  detectors can be operated in a windowless configuration at
  extreme-ultraviolet and soft x-ray wavelengths or in a sealed
  configuration at ultraviolet and visible wavelengths. Prototype
  MAMA detectors with up to 512 x 512 pixels are now being tested in
  the laboratory and telescope operation of a simple (10 x 10)-pixel
  visible-light detector has been initiated. In this paper the methods
  of construction and the modes of operation of the MAMA detectors are
  described and the status of the development program is reviewed.

---------------------------------------------------------
Title: Detector arrays for photometric measurements at soft X-ray,
    ultraviolet and visible wavelengths
Authors: Timothy, J. G.; Mount, G. H.; Bybee, R. L.
1979SPIE..183..169T    Altcode:
  The construction and modes of operation of the Multi-Anode Microchannel
  Array (MAMA) detectors are described, and the designs of spectrometers
  utilizing them are outlined. MAMA consists of a curved microchannel
  array plate, an opaque photocathode (peak quantum efficiency of 19%
  at 1216 A), and a multi-anode (either discrete- or coincidence-anode)
  readout array. Designed for use in instruments on spaceborne
  telescopes, MAMA can be operated in a windowless configuration
  in extreme-ultraviolet and soft X-ray wavelengths, or in a sealed
  configuration at UV and visible wavelengths. Advantages of MAMA include
  low applied potential (less than 3.0 kV), high gain (greater than 10
  to the 6th electrons/pulse), low sensitivity to high-energy charged
  particles, and immunity to external magnetic fields of less than
  500 Gauss

---------------------------------------------------------
Title: Multi-anode microchannel arrays
Authors: Timothy, J. G.; Mount, G. H.; Bybee, R. L.
1979SPIE..190..360T    Altcode:
  The Multi-Anode Microchannel Arrays (MAMA's) are a family of
  photoelectric, photon-counting array detectors being developed for use
  in instruments on both ground-based and space-borne telescopes. These
  detectors combine high sensitivity and photometric stability with a
  high-resolution imaging capability. MAMA detectors can be operated
  in a windowless configuration at extreme-ultraviolet and soft X-ray
  wavelengths or in a sealed configuration at ultraviolet and visible
  wavelengths. Prototype MAMA detectors with up to 512 x 512 pixels
  are now being tested in the laboratory and telescope operation of a
  simple (10 x 10)-pixel visible-light detector has been initiated. The
  construction and modes-of-operation of the MAMA detectors are briefly
  described and performance data are presented.

---------------------------------------------------------
Title: Comprehensive analysis of gratings for ultraviolet space
    instrumentation
Authors: Mount, G. H.; Fastie, W. G.
1978ApOpt..17.3108M    Altcode:
  Comprehensive measurements in the vacuum UV range of 1200-3000 A of
  efficiency, polarization, and scattering of classically ruled and
  photoresist gratings are reported. The results show that the art
  of ruling gratings for vacuum UV use has reached a high level of
  sophistication and that careful analysis of grating properties can
  lead to useful improvement of the ruling art.

---------------------------------------------------------
Title: A search for far-ultraviolet emission from Sirius B.
Authors: Brune, W. H.; Feldman, P. D.; Mount, G. H.
1978ApJ...225L..67B    Altcode:
  A rocket observation of Sirius in the far-UV region from 912 to 1240
  A is reported. It is found that only a few counts were detected which
  can possibly be attributed to the hydrogen-rich white dwarf Sirius
  B. An upper limit of 2.0 by 10 to the -10th power erg/sq cm per sec/A
  on the Sirius B flux in the range from 1000 to 1080 A is established
  with 99.3% confidence. This upper limit is shown to constrain the
  model-dependent effective temperature of Sirius B to be less than or
  approximately 27,000 K. It is concluded that the observed X-ray flux
  from Sirius cannot be emitted by the photosphere of Sirius B.

---------------------------------------------------------
Title: Photoabsorption cross sections of methane and ethane, 1380 -
    1600 Å, at T = 295K and T = 200K.
Authors: Mount, G. H.; Moos, H. W.
1978ApJ...224L..35M    Altcode:
  Photoabsorption cross sections of methane and ethane have been
  determined in the wavelength range from 1380 to 1600 A at room (295 K)
  and dry-ice (200 K) temperatures. It is found that the room-temperature
  ethane data are in excellent agreement with the older measurements of
  Okabe and Becker (1963) rather than with more recent determinations
  and that a small systematic blueshift occurs at the foot of the
  molecular absorption edges of both gases as the gases are cooled from
  room temperature to 200 K, a value close to the actual temperature of
  the Jovian atmosphere. It is concluded that methane photoabsorption
  will dominate until its cross section is about 0.01 that of ethane,
  which occurs at about 1440 A, and that ethane should be the dominant
  photoabsorber in the Jovian atmosphere in the region from above 1440
  A to not farther than 1575 A.

---------------------------------------------------------
Title: Continuum Modeling of Ultraviolet Rocket Spectra (900-3100
    Å Five Early-Type Stars.
Authors: Mount, G. H.; Brune, W. H.; Feldman, P. D.
1977BAAS....9..570M    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: Photoabsorption cross section of methane from 1400 to 1850 Å.
Authors: Mount, G. H.; Warden, E. S.; Moos, H. W.
1977ApJ...214L..47M    Altcode:
  Photoabsorption cross sections of methane in the 1400-1850-A spectral
  region have been measured. Cross sections at wavelengths greater
  than 1475 A are approximately 200 times smaller than those currently
  accepted. This has a significant effect on the interpretation of
  spectral measurements of the Jovian planets in this wavelength region.

---------------------------------------------------------
Title: Compact far ultraviolet emission source with rich spectral
    emission 1150-3100 &amp;Aring
Authors: Mount, George H.; Yamasaki, G.; Fowler, Walter; Fastie,
   William G.
1977ApOpt..16..591M    Altcode:
  The article describes a compact hollow Pt cathode emission source
  for the far UV, developed for use as a high-resolution wavelength
  standard in laboratory work or on spacecraft (specifically, the
  NASA International UV Explorer - IUE). The source is small, rugged,
  lightweight, spectrally rich, bright in the 1150-3200 A region, features
  long service life, low operating voltage, and lower power drain, and
  stably emits a large number of very sharp lines with a spectrum lending
  itself to projection onto the focal plane of a spectrograph. The source
  has successfully passed exacting environmental tests, and serves as a
  transfer standard for absolute sensitivity calibration of spectrometric
  instruments.

---------------------------------------------------------
Title: Moderate Resolution Ultraviolet Rocket Observations 912-3100
    Å of Seven Early-Type Stars.
Authors: Brune, W. H.; Mount, G. H.; Feldman, P. D.
1977BAAS....9..366B    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: A new solar carbon abundance based on non-LTE CN molecular
    spectra.
Authors: Mount, G. H.; Linsky, J. L.
1975ApJ...202L..51M    Altcode:
  A detailed non-LTE analysis of solar CN spectra strongly suggest a
  revised carbon abundance for the sun. We recommend a value of log
  carbon abundance = 8.35 plus or minus 0.15 which is significantly
  lower than the presently accepted value of log carbon abundance =
  8.55. This revision may have important consequences in astrophysics.

---------------------------------------------------------
Title: A non-LTE analysis of the CN 3883 Å band head in the upper
    photosphere of Arcturus.
Authors: Mount, G. H.; Ayres, T. R.; Linsky, J. L.
1975ApJ...200..383M    Altcode:
  A detailed non-LTE study of the CN(0,0) 3883 A band-head spectrum of
  Arcturus (K2 iii) provides an accurate determination of the carbon,
  nitrogen, and oxygen abundances in Arcturus. Non-LTE effects are
  significant, and we find that the Ayres-Linsky model provides an
  adequate fit to the observations for [C,N]* = 13[C,N]0 and [O]* =
  0.60[0]o, or for [C,N,O]* = 16[C,N,O]0, but the latter abundances are
  unlikely. The upper photospheric microturbulence is found to be 2.5
  + . Subject headings: abundances, stellar - atmospheres, stellar -
  late-type stars - molecules - stars, individual (alpha Boo)

---------------------------------------------------------
Title: One- and Multi-Component Models of the Upper Photosphere Based
on Molecular Spectra. IV: Non-LTE Treatment of the CN Violet System
Authors: Mount, G. H.; Linsky, J. L.
1975SoPh...41...17M    Altcode:
  Non-LTE synthetic spectra derived from a detailed analysis of
  the formation of the CN (0, 0) λ13883 Å spectrum are compared
  with center-limb photoelectric spectra taken at Kitt Peak National
  Observatory.1 Significant non-LTE effects are found and the Kurucz,
  Altrock-Cannon, Mount-Linsky II, and HSRA models are compared. We
  derive a solar carbon abundance of A<SUB>c</SUB>=8.30±0.10 for the
  Mount-Linsky model and A<SUB>c</SUB>=8.40±0.10 for the Altrock-Cannon
  model, compared to the HSRA value of A<SUB>c</SUB>=8.55±0.10, assuming
  a nitrogen abundance of logA<SUB>N</SUB>=7.93. In addition we specify
  the regions of formation for the CN(0, 0) 3883.35 Å bandhead at disc
  center and limb.

---------------------------------------------------------
Title: Models of the upper photospheres of the Sun and Arcturus
    based on molecular spectra
Authors: Mount, George Henry
1975PhDT.......265M    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: Models of the Upper Photospheres of the Sun and Arcturus
    Based on Molecular Spectra.
Authors: Mount, G. H.
1975PhDT.........5M    Altcode:
  Accurate photoelectric center limb spectra of the solar CN and CH
  molecules and CN spectroheliograms were obtained. These observations,
  together with observations of the solar CO fourth positive EUV system
  and the Griffin Arcturus Atlas, were compared with theoretical LTE
  and non-LTE spectra of CN, CH, and CO in the Sun and CN in Arcturus
  (K2 III). The molecular line source functions deviate significantly in
  all cases from the Planck function, and thus it was found that non-LTE
  effects are critical in interpreting molecular spectra in the Sun and
  Arcturus. Data also show that the solar photospheric model based on CN,
  CH, and CO spectra gives better agreement with observation. Both LTE
  and non-LTE CN and CH analyses demonstrate that the presently assumed
  value of the solar carbon abundance must be significantly reduced.

---------------------------------------------------------
Title: Non-LTE Models of the Upper Solar Photosphere Based on CN
    Molecular Spectra
Authors: Mount, G. H.; Linsky, J. L.
1974BAAS....6Q.347M    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: One- and Multi-Component Models of the Upper Photosphere Based
on Molecular Spectra. III: CH (0, 0) λ 3144 of the CH C-X System
Authors: Mount, George H.; Linsky, Jeffrey L.
1974SoPh...36..287M    Altcode:
  We have obtained accurate center-to-limb photoelectric spectra of
  the CH (0, 0) C-X bandhead region λ3143-3148 Å at Kitt Peak National
  Observatory. From these spectra and a detailed analysis of the formation
  of the CH (0, 0) spectrum we demonstrate that the best-fit upper
  photospheric model derived from our previous analyses of CN (0, 0)
  and CN (1, 1) spectra adequately explains the CH C-X observations. In
  addition we derive a solar carbon abundance of ±0.20 compared to the
  HSRA value of log A<SUB>c</SUB> = 8.55. This confirms our previous
  CN analyses which demonstrated that if the HSRA nitrogen abundance of
  log A<SUB>N</SUB> = 7.93 ± 0.10 is assumed, then log A<SUB>c</SUB> =
  8.20 ± 0.10. We also specify the regions of formation for the CH(0,
  0) λ3143.47 Å band-head at disc center and limb.

---------------------------------------------------------
Title: One- and Multi-Component Models of the Upper Photosphere
Based on Molecular Spectra. II: CN (1, 1) of the CN Violet System
Authors: Mount, George H.; Linsky, Jeffrey L.
1974SoPh...35..259M    Altcode:
  We have obtained center-to-limb photoelectric spectra of the CN(1,1) B-X
  bandhead region λ3868-3872 Å at Kitt Peak National Observatory. From
  these spectra and a detailed analysis of the formation of the CN (1,
  1) spectrum we derive a best-fit upper photospheric model differing
  from the HSRA which is consistent with our previous CN(0, 0) λ3883
  spectra. We derive a solar carbon abundance of log A<SUB>c</SUB> =
  8.30 ± 0.10 compared to the HSRA value of log A<SUB>c</SUB> = 8.55
  ± 0.10. In addition we specify the regions of formation for the CN(0,
  0) λ3883.35 and CN(1, 1) λ 3871.38 bandheads at disc center and limb.

---------------------------------------------------------
Title: Models of the Upper Solar Photosphere Based on CN and CH
    Molecular Spectra.
Authors: Mount, G. H.; Linsky, J. L.
1973BAAS....5..444M    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: One- and Multi-Component Models of the Upper Photosphere
Based on Molecular Spectra. I: The Violet System of CN(0,0)
Authors: Mount, George H.; Linsky, Jeffrey L.; Shine, Richard A.
1973SoPh...32...13M    Altcode:
  Spectroheliograms taken in the CN(0, 0) violet band near λ 3883
  Å show very small scale network and cell structures with high
  contrast. The bandhead itself, which is a broad feature due to
  overlap of several CN lines, allows the diagnostic simplicity of a
  continuum since motions, magnetic fields, and broadening mechanisms
  are unimportant. We have obtained spectroheliograms in the bandhead
  and center-to-limb photoelectric spectra of CN(0, 0) at Kitt Peak
  National Observatory. From the photoelectric spectra and a detailed
  analysis of the formation of the CN(0, 0) spectrum we derive a best-fit
  one-component upper photospheric model differing from that of the
  HSRA and recommend a change in solar carbon abundance from the HSRA
  value of logA<SUB>c</SUB> = 8.55 to logA<SUB>c</SUB> = 8.25. From the
  calibrated spectroheliograms we consider a multi-component model to
  account for the observed fine structure intensity variations.

---------------------------------------------------------
Title: One- and Multi-Component Models of the Upper Photosphere
    based on the 3883 Å Band Head of CN
Authors: Mount, George H.; Linsky, Jeffrey L.
1973BAAS....5V.277M    Altcode:
  No abstract at ADS

---------------------------------------------------------
Title: On the validity of a generalized Kirchhoff's law for a
    nonisothermal scattering and absorptive medium
Authors: Linsky, Jeffrey L.; Mount, George H.
1972Icar...17..193L    Altcode:
  The relationship of directional hemispherical reflectivity to emissivity
  is investigated for a nonisothermal medium with isotropic coherent
  scattering and absorption. Departures from a generalized Kirchhoff's
  Law occur due to the long range nature of the scattering process. Such
  departures occur in lunar thermal emission at microwave but not at
  infrared frequencies.