Author name code: kurochka
ADS astronomy entries on 2022-09-14
author:"Kurochka, L.N."
------------------------------------------------------------------------
Title: Non-Gaussian Doppler profiles of spectral lines at the
maxwellian velocity distribution
Authors: Kurochka, L. N.; Loboda, V. I.
Bibcode: 2001KFNT...17..478K
Altcode:
The case of the non-Gaussian Doppler profiles of spactral lines (at a
small optical thickness of the investigation object) is considered. It
is shown that such a sitiation may exist not only at the non-Maxwellian
velocity distribution, but at the Maxwellian distribution as well. The
reason is that turbulent elements may have different radiation
intensities, which is a realistic assumption, but this was ignored in
the analyses of solar flares and other astrophysical objects.
Title: CCD observations of the Sun at the Balmer and Paschen continua.
Authors: Kurochka, L. N.; Belkina, I. L.; Beletskij, S. A.; Korokhin,
V. V.; Marchenko, G. P.
Bibcode: 1999A&AT...18..265K
Altcode:
Preliminary results of solar CCD observations of the Balmer and Paschen
continua and of the Balmer precontinuum are presented. The Balmer
precontinuum intensity distribution for the emission features of AR
7890 NOAA/USAF are obtained. The limits of electronic concentration in
the plasma volume along the line of sight are evaluated for an emission
feature from this AR. Solar monitoring at the hydrogen series continua
and precontinua appears to have considerable promise.
Title: Subtelescopic structure of the solar corona at observation
in Thomson and Balmer continuum.
Authors: Kurochka, L. N.; Matsuura, O. T.; Picazzio, E.; Tellefsen,
V.; Stegmann, S.; Bedaque, I. P.
Bibcode: 1998IBUAA..12...34K
Altcode:
No abstract at ADS
Title: Observations and analysis of emission from solar active
regions at the edge of the Balmer continuum
Authors: Kurochka, L. N.; Belkina, I. L.; Beletskij, S. A.; Korokhin,
V. V.; Marchenko, G. P.
Bibcode: 1997AZh....74..460K
Altcode:
The first results of CCD observations of the sun in the Balmer and
Paschen continua and in the Balmer precontinuum are presented. The
intensity distribution in the Balmer precontinuum in a knot in the
active region NOAA/USAF 7890 provides information about inhomogeneities
in the electron density of the plasma along the line of sight. The value
of conducting monitoring observations of this kind is demonstrated.
Title: Observations and analysis of emission from solar active
regions at the edge of the Balmer continuum
Authors: Kurochka, L. N.; Belkina, I. L.; Beletskii, S. A.; Korokhin,
V. V.; Marchenko, G. P.
Bibcode: 1997ARep...41..404K
Altcode:
No abstract at ADS
Title: Subtelescopic Inhomogeneities of Electron Density in The
Solar Corona
Authors: Kurochka, L. N.; Matsuura, O. T.; Picazzio, E.
Bibcode: 1997SoPh..170..227K
Altcode:
The brightness of the solar corona due to Thomson scattering depends
linearly on the electron density, while the brightness due to the
Balmer continuum is proportional to its square. As a consequence,
information on the distribution of the electron density in the corona
can be obtained by comparing the radial profiles of the surface
brightness in both continua. This idea was explored for the first
time in the solar eclipse of November 03, 1994, in Foz do Iguaçu,
PR, Brazil. Pictures of the corona were obtained with interference
filters, one centered at 477 nm (Thomson continuum) and another one at
347 nm (Balmer continuum). The second filter also transmits the Thomson
continuum through its spectral window, so that the Balmer images contain
Thomson contamination. This paper reports on the observational results
and presents their preliminary analysis. It was found that in certain
radial directions, the normalized profiles of both continua (Thomson
and contaminated Balmer) coincide, but in other directions they differ
significantly. The non-coincident profiles may only occur if Balmer
emission becomes important in relation to the Thomson scattering. A
simple calculation shows that in such cases the electron density in
the inner corona must exceed the values of standard models by up to
≃ 6.1 × 104 times, maintaining however the total number
of electrons along the line of sight in agreement with the prediction
of standard models. It is concluded that the corona contains high
electron concentration in cloudlets of subtelescopic sizes down to
≃ 106 cm. The varied behavior of the radial profiles
of both continua in different radial directions, suggests that the
subtelescopic structures might be related to the spatially variable
topology of coronal magnetic flux tubes.
Title: Objectives of a Ukrainian solar-oriented satellite.
Authors: Kryachko, I. P.; Kurochka, L. N.; Tel'Nyuk-Adamchuk, V. V.
Bibcode: 1997ASIC..494..233K
Altcode: 1997topr.conf..233K
The project is focused on the ultilization of the Ukrainian space
technology and industrial potential, within the framework of the
National Space Agency of Ukraine activity. The initial stages of the
project are: concept formulation, compilation of preliminary proposals,
outlining of the set of appropriate scientific experiments to be made
in space, matching both the demands of scientific experiments and
the technical possibilities for their accomplishment, in light of the
desirable orbit parameters, satellite orientation accuracy, and so on.
Title: A possibility for studying subtelescopic structures in the
solar corona.
Authors: Kryachko, I. P.; Kurochka, L. N.; Tel'Nyuk-Adamchuk, V. V.
Bibcode: 1997ASIC..494..177K
Altcode: 1997topr.conf..177K
It is shown that information on the existence of subtelescopic
(unresolved) inhomogeneities having increased density in the coronal
structures may be obtained by comparing two filtergrams one either
side of the Balmer jump, one at λ < 365 nm and the other at,
for example λ = 580 nm or λ = 477 nm.
Title: Reobservation of Subtelescopic Coronal Condensation in the
Solar Eclipse of February 26, 1998
Authors: Picazzio, E.; Matsuura, O. T.; Kurochka, L. N.; Fogliano,
F. I.
Bibcode: 1996RoAJ....6..103P
Altcode:
No abstract at ADS
Title: The Balmer Jump in Astrophysical Hydrogen Plasmas
Authors: Kurochka, L. N.
Bibcode: 1995SoPh..156...65K
Altcode:
It is shown that, according to accepted theoretical concepts, there
should be no intensity jump at the edge of the Balmer continuum,
nor at that of other hydrogen series. We point out three reasons for
a fairly smooth increase of the intensity to occur at the continuum
edge. As a result, `the jump' sometimes spreads over hundreds of
ångstroms, due mainly to the electron density inhomogeneity of solar
plasma. Furthermore, the Doppler and Stark effects also give rise to
a considerable spread of the series edge. We point out that excess
continuum emission over a relatively narrow spectral interval before
the continuum edge can result from overlapping of line wings.
Title: On the Recording of Regions with Increased Plasma Density on
the Sun
Authors: Kurochka, L. N.; Kriachko, I. P.; Markova, E.
Bibcode: 1992SoPh..139..275K
Altcode:
For the purpose of studying the statistics, dynamics, and morphology
of parts of the solar surface with enhanced emission measure and
considerable inhomogeneities of electron concentration, it is suggested
that a new type of solar observation be introduced: taking filtergrams
by means of interference filters, calculated for the Balmer continuum
limit and the region of the blue continuum. To determine accurately
the inhomogeneity of the electron concentration in an object, it is
suggested to scan the surface of the object and record the spectrum
of the blue continuum by means of a spectrochronograph.
Title: Structural changes in the solar corona during the July
1991 eclipse
Authors: Zirker, J. B.; Koutchmy, S.; Nitschelm, C.; Stellmacher, G.;
Zimmermann, J. P.; Martinez, P.; Kim, I.; Dzyubenko, N.; Kurochka,
L.; Makarov, V.
Bibcode: 1992A&A...258L...1Z
Altcode:
Preliminary results of the analysis of radially filtered pictures
obtained at several hours interval during the July 11, 1991 total
solar eclipse are given. Instrumental parameters and method are
outlined. Structural changes are discussed.
Title: The solar corona of July 11, 1991. Observations in Brazil
(MICE).
Authors: Dzyubenko, N. I.; Kurochka, L. N.; Rubo, G. A.; Kim,
I. S.; Artamonov, B. P.; Boczko, R.; Matsuura, O. T.; Koutchmy, S.;
Zimmermann, J. P.; Zirker, J. B.
Bibcode: 1992ATsir1552...21D
Altcode:
No abstract at ADS
Title: The Kiev University expedition for observing the solar eclipse
of July 11, 1991.
Authors: Dzyubenko, N. I.; Kurochka, L. N.; Tel'Nyuk-Adamchuk, V. V.
Bibcode: 1992VisKi...6..100D
Altcode:
Information is given about the Kiev University expedition for the
total solar eclipse on 11 July 1991 observation in Brazil (dynamics and
structure of the solar corona) and in Mexico (investigation of solar
diameter variations). The expedition was successful, photographs of
the solar corona and photometric records of the solar flux near the
total eclipse phase were obtained.
Title: Registration of macro- and micro-inhomogeneities of plasma
density in astrophysical objects.
Authors: Kurochka, L. N.
Bibcode: 1991KFNT....7...31K
Altcode: 1991KFNT....7d..31K; 1991KNFT....7...31K
Expedience of observations of extended astrophysical objects (like
solar formations) using a broad-band filter behind the Balmer limit
is indicated. These filtergrams may give information on macroscopic
inhomogeneities of plasma density. It is shown that rather good
knowledge about micro-inhomogeneities of plasma density (on the
subtelescopic level) and extension of the volumes with different
electron density can be received from intensity distribution in the
Balmer or other hydrogen series precontinuum.
Title: Registration of macro- and micro-inhomogeneities of plasma
density in astrophysical objects.
Authors: Kurochka, L. N.
Bibcode: 1991KPCB....7d..25K
Altcode: 1991KPCB....7...25K
The advantages of setting up observations of extended astrophysical
objects (such as solar formations) using a broadband filter beyond the
limit of the Balmer continuum are indicated. The filtergrams would give
information on macroscopic plasma-density inhomogeneities. It is shown
that a rather complete picture of plasma-density micro-inhomogeneities
(at the subtelescopic level) and extended regions with contrasting
electron densities can be obtained from data on the intensity
distribution in the region of the Balmer precontinuum or the
precontinuum of another series.
Title: Microinhomogeneities and Macroinhomogeneities of Density in
a Quiescent Prominence
Authors: Kurochka, L. N.; Kiryukhina, A. I.
Bibcode: 1990LNP...363..238K
Altcode: 1990IAUCo.117..238K; 1990doqp.coll..238K
The analysis of a bright prominence of August 13, 1972 was carried
out. Continuous spectrum due to Thomson scattering of solar radiation on
free electrons and the Balmer precontinuum stipulated by free bounded
transitions in the volumes with different electron concentration ne
(Kurochka, Kiryukhina, 1989) were observed in the spectrum of this
prominence. Heir intensities can be explained only by assuming that
there are volumes with different values of electron concentration ( 1010
ne 1012 cm-3) and extension in the prominence ( 105 109 ). In addition,
there are extended volumes ( with ℓ of the order of the active region
size and even larger) with relatively low temperature( Te < 104 K)
and electron concentration intermediate between the concentration in
the prominence and that of the corona( 109 ⩽ ne ⩽ 1010 cm -3 ).
Title: Radiation from solar flares in the X-ray and optical ranges
of the spectrum.
Authors: Kurt, V. G.; Kurochka, L. N.; Zenchenko, V. M.
Bibcode: 1989CosRe..27..358K
Altcode:
Measurements of hard X-ray radiation, Xh, from 180 solar
flares, carried out on board the spacecraft Venera-13, -14, were
compared with measurements of optical and thermal X-ray radiation,
XT. The total quantity of energy release during the
burst in these bands was calculated, and a correlation analysis was
conducted. The resulting correlation relationships give evidence
that the total energy of the fast electrons responsible for the
Xh-burst in the impulsive phase of the flare is related to
the thermal energy at the end of the impulsive phase in a practically
functional way. The quantitative relationship was determined between
the importances of the flares in the Hα line and the
most probable values of the energy content in the various bands of
radiation, by means of computations grounded within the generally
accepted models. It is evident that the total energy of the optical
(cool) part of the flare, the energy of the radiation in the X-ray
band, and the energy introduced into the flaring volume by energetic
particles are comparable with one another.
Title: Investigations of solar flares in the X-ray and optical
spectral regions.
Authors: Kurt, Viktoriia; Kurochka, L. N.; Zenchenko, V. M.
Bibcode: 1989KosIs..27..425K
Altcode: 1989CosRe..27..425K
Measurements of hard X-ray emission from 180 solar flares, as obtained
on the Venera 13 and 14 probes, are compared with measurements
of optical and thermal X-ray emissions. Values of the total energy
release during a flare are calculated in these ranges, and a correlation
analysis is carried out. The correlations found indicate that the total
energy of fast electrons causing hard X-ray bursts in the impulsive
flare phase and the thermal energy at the end of the impulsive phase
have practically a functional relationship.
Title: Flare processes in a quiet prominence
Authors: Kurochka, L. N.; Kiryukhina, A. I.
Bibcode: 1989PAZh...15...82K
Altcode:
A novel method is proposed for determining the limits of electron
concentration variations in a plasma along the line of sight from the
precontinuum of the Balmer series. The characteristic value of n(e)
for volumes responsible for hydrogen line emission is about 5 x 10
to the 10th/cu cm. It is concluded that, at small volumes of a quiet
prominence, a powerful flarelike energy release takes place which
manifests itself in a Balmer precontinuum.
Title: Analysis of the optical spectrum of a solar flare taking
structural inhomogeneities into account.
Authors: Shaab, M. V.; Gladushina, N. A.; Kurochka, L. N.
Bibcode: 1989VeKie..31...30S
Altcode:
No abstract at ADS
Title: The Height of Location of Optical Solar Flares
Authors: Venglinsky, E. R.; Kurochka, L. N.; Rossada, V. M.
Bibcode: 1989BSolD..12...85V
Altcode:
No abstract at ADS
Title: Flare Processes in a Quiescent Prominence
Authors: Kurochka, L. N.; Kiryukhina, A. I.
Bibcode: 1989SvAL...15...36K
Altcode:
No abstract at ADS
Title: The radiative energy of active regions on the Sun.
Authors: Venglinskij, E. R.; Zemanek, E. N.; Kurochka, L. N.
Bibcode: 1989VeKie..31...39V
Altcode:
No abstract at ADS
Title: On a possibility of observing the 1990 July 22 solar eclipse
in Taimyr and Indegirka.
Authors: Drake, N. A.; Kurochka, L. N.
Bibcode: 1988ATsir1532....8D
Altcode:
No abstract at ADS
Title: Simultaneous observations of the solar spectrum in the infrared
and visible regions with a new echelle spectrograph.
Authors: Kurochka, L. N.; Lozitskaya, N. I.; Lozitskij, V. G.; Nagulin,
Yu. S.
Bibcode: 1988VeKie..30...46K
Altcode:
No abstract at ADS
Title: Radiation energy estimation and analysis of optical solar
flares observed in 1978.
Authors: Kurochka, L. N.; Lozitskii, V. G.; Palus, P.
Bibcode: 1987KFNT....3...46K
Altcode:
Radiation energies of 5508 flares observed in 1978 are estimated. The
radiation in all lines and in continua of hydrogen series (beginning
with Lyman) with typical parameters of the flares of different
intensities is taken into consideration. Mean energy values are obtained
for flares of every importance which increase with importance, whereas
the number of the flares observed decreases. With the flare energy
decrease their number increases at first up to 5×1020J
and then fastly decreases. This suggests that the flares on the Sun
are independent events among other non-stationary processes.
Title: Energy Distribution of 15000 Solar Flares
Authors: Kurochka, L. N.
Bibcode: 1987SvA....31..231K
Altcode:
No abstract at ADS
Title: Energy distribution of 15, 000 solar flares
Authors: Kurochka, L. N.
Bibcode: 1987AZh....64..443K
Altcode:
An estimation of the radiation energy of 15 thousand flares observed
during the period of 1978 - 1979 is made and an analysis is performed
of their energy distribution. An equation is suggested for the
energetic flare index which is characteristic of the flare energy
release. Arguments are presented in favour of the idea that solar
flares are an independent class of events on the sun. It is shown
that the distributions of flares over energy both on the sun and on
the UV Cet-type stars can be expressed by power dependences and have
the same exponent.
Title: Variability of the sign of the altitude gradient of the
magnetic field in the solar flare of July 25, 1981.
Authors: Lozitskij, V. G.; Kurochka, L. N.; Lozitskaya, N. I.
Bibcode: 1987SvA....30..484L
Altcode:
No abstract at ADS
Title: Comparison of the total energy release in the optical and
hard X-ray ranges of solar flares (Catalog).
Authors: Zenchenko, V. M.; D'Yachkov, A. V.; Kurochka, L. N.; Kurt,
V. G.; Yurovitskaya, E. V.
Bibcode: 1987BSolD1987...48Z
Altcode:
An instrument is briefly described which measures hard X-ray radiation
with an energy Ex > 50 keV from solar flares. The
measurements were made on board the Venera 13, 14 spacecraft. These
flares were used as a basis for a catalog where the total energy
flux in the optical Eopt and hard X-ray EHx
ranges of solar flares is compared. The procedure of EHx
and Eopt calculations is described.
Title: Magnetic field inhomogeneity in the solar flare of
25. VII. 1981.
Authors: Lozitskij, V. G.; Lozitskaya, N. I.; Kurochka, L. N.
Bibcode: 1987VeKie..29...33L
Altcode:
No abstract at ADS
Title: Variability of the sign of the altitude gradient of the
magnetic field in the solar flare of July 25, 1981
Authors: Lozitskii, V. G.; Kurochka, L. N.; Lozitskaia, N. I.
Bibcode: 1986AZh....63..814L
Altcode:
It is found that the magnetic field gradient in the flare of July 25,
1981 changed its sign with depth not less than 2-3 times. This result
was obtained during the investigation of the flare's Zeeman spectrogram
which involved the use of magnetosensitive lines located in the far
wings of the H-beta line. It is suggested that the oscillating tail
left behind by an MHD-soliton propagating in the flare is responsible
for this marked sign change.
Title: Variability of the Sign of the Altitude Gradient of the
Magnetic Field in the Solar Flare of 1981JUL25
Authors: Lozitskii, V. G.; Kurochka, L. N.; Lozitskaya, N. I.
Bibcode: 1986SvA....30..484L
Altcode:
No abstract at ADS
Title: Heterogeneity in magnetic field of the solar flare on June
25, 1981
Authors: Lozitskii, V. G.; Lozitskaya, N. I.; Kurochka, L. N.;
Vapulik, B.
Bibcode: 1986CoSka..15..273L
Altcode:
No abstract at ADS
Title: Energy distribution of 10,000 solar flares observed in 1979.
Authors: Kurochka, L. N.
Bibcode: 1986VeKie..28...17K
Altcode:
No abstract at ADS
Title: Methods and results of an investigation of spectra of optical
solar flares.
Authors: Kurochka, L. N.
Bibcode: 1984VeKie..26...33K
Altcode:
No abstract at ADS
Title: On a statistical connection of radiation energy of solar
flares in the optical and radio range.
Authors: Kurochka, L. N.; Pogodin, I. E.
Bibcode: 1983soac.conf...48K
Altcode:
No abstract at ADS
Title: Physical conditions and peculiarities of the subtelescopic
structure of flares.
Authors: Kurochka, L. N.
Bibcode: 1982cis..conf..160K
Altcode:
No abstract at ADS
Title: The Energy of Optical Solar Flares - Part One
Authors: Kurochka, L. N.; Stasyuk, L. A.
Bibcode: 1981BSolD...5...83K
Altcode:
No abstract at ADS
Title: The Energy of Optical Flares Radiation - Part Three
Authors: Kurochka, L. N.; Rossada, V. M.
Bibcode: 1981BSolD...7...95K
Altcode:
No abstract at ADS
Title: Emission energy of optical solar flares. I.
Authors: Kurochka, L. N.; Stasyuk, L. A.
Bibcode: 1981BSolD1981...83K
Altcode:
No abstract at ADS
Title: Energy of optical solar flares. II. III.
Authors: Kurochka, L. N.; Rossada, V. M.
Bibcode: 1981BSolD1981...78K
Altcode:
No abstract at ADS
Title: The Energy of Optical Solar Flares - Part Two
Authors: Kurochka, L. N.; Rossada, V. M.
Bibcode: 1981BSolD...6...78K
Altcode:
No abstract at ADS
Title: Horizontal solar telescope of the Kiev University Astronomical
Observatory.
Authors: Kurochka, E. V.; Kurochka, L. N.; Lozitskij, V. G.;
Lozitskaya, N. I.; Ostapenko, V. A.; Polupan, P. N.; Romanchuk, P. R.;
Rossada, V. M.
Bibcode: 1980VeKie..22...48K
Altcode:
No abstract at ADS
Title: Weakening of photospheric emission when passing through
chromospheric flares. II.
Authors: Ostapenko, V. A.; Kurochka, L. N.
Bibcode: 1979BSolD1979...87O
Altcode:
No abstract at ADS
Title: The Weakening of the Photospheric Emission after Going Through
the Solar Flares - Part Two
Authors: Ostapenko, V. A.; Kurochka, L. N.
Bibcode: 1979BSolD...6...87O
Altcode:
No abstract at ADS
Title: Results of a determination of the physical conditions in
different solar flares. I.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1979BSolD1978...77K
Altcode:
No abstract at ADS
Title: Blurring of lines at the limit of the hydrogen series.
Authors: Kurochka, L. N.; Rybko, L. B.
Bibcode: 1979Afz....15..155K
Altcode:
An expression is obtained for determining the electron density in a
hydrogen plasma on the basis of the last observable line in the Balmer
series. The expression is derived for the case of line broadening by
the Stark effect (ions + electrons) and the Doppler effect when the
observations are made in the presence of background radiation that
reduces the line contrast.
Title: Electron temperature and temperature of Lalpha emission in
solar features.
Authors: Kurochka, L. N.; Kurochka, E. V.; Ostapenko, V. A.
Bibcode: 1979BSolD1978...94K
Altcode:
No abstract at ADS
Title: Weakening of photospheric emission at the transit through
chromospheric flares. I.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1979BSolD1978...68K
Altcode:
No abstract at ADS
Title: Blurring of lines at the limit of the hydrogen series
Authors: Kurochka, L. N.; Rybko, L. B.
Bibcode: 1979Ap.....15...93K
Altcode:
No abstract at ADS
Title: Calculation of line profiles of inhomogeneous solar formations.
Authors: Kurochka, L. N.; Telniuk-Adamchuk, V. V.
Bibcode: 1978SoPh...59...11K
Altcode:
A generalized equation was obtained for calculation of line profiles
of solar formations in the assumption of their inhomogeneity. Line
profiles of homogeneous formations are a particular consequence of
this equation. Analysis of the equation and line profiles calculated
from it was carried out.
Title: The last observable line in hydrogen emission spectrum.
Authors: Kurochka, L. N.; Ribko, L. B.
Bibcode: 1978SoPh...57..319K
Altcode:
It is shown that outside continuous solar spectrum or diffused solar
light in the Earth's atmosphere substantially reduces the contrast
and quality of observable emission lines in the hydrogen spectrum. A
formula is obtained which enables the electron concentration in hydrogen
plasma to be determined by the last observable line with due account
for outside (spurious) continuous spectrum.
Title: Optical Thicknesses and Degree of Ionization of Hydrogen in
Chromospheric Flares of Various Importances
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1978BAICz..29...82K
Altcode:
No abstract at ADS
Title: Physical conditions in large solar flares. I. A calculation
method.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1978BSolD1978...67K
Altcode:
No abstract at ADS
Title: Physical conditions in chromospheric flares of mean importance.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1978VeKie..20...14O
Altcode: 1978VeKie..20...14K
No abstract at ADS
Title: Physical conditions in large solar flares. II. Results of
calculation.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1978BSolD1978...82K
Altcode:
No abstract at ADS
Title: Line profiles of inhomogeneous solar phenomena with different
porosity.
Authors: Kurochka, L. N.; Telniuk-Adamchuk, V. V.
Bibcode: 1977AAfz...33...41K
Altcode:
A formula is obtained for calculating the line profiles of inhomogeneous
solar structures with their porous structure taken into account. The
formula is valid for chaotic macroscopic motions in inhomogeneous
emission objects. It is assumed that the emission centers are
homogeneous and the macroscopic motion of the objects is precisely the
motion of individual emission elements of fine structure. The formula
takes into account the mutual screening of elements. Simplifications
of the formula are available when macroscopic motions are absent and
mutual screening is small. Tabulated values of a particular function are
provided, needed for the case of Maxwellian distribution of macroscopic
velocities of emission elements and constant source function along
the line of sight within each element.
Title: Main parameters for optically flares of different
importance. I.
Authors: Kurochka, L. N.
Bibcode: 1977BSolD1977...53K
Altcode:
No abstract at ADS
Title: On the number of lines observed in the hydrogen spectrum.
Authors: Kurochka, L. N.
Bibcode: 1977BSolD1977...90K
Altcode:
No abstract at ADS
Title: Why few lines of the Balmer series are observed in flares on
the disk
Authors: Kurochka, L. N.; Sitnik, G. F.
Bibcode: 1976SvA....19..590K
Altcode:
It is shown that upper-level populations of hydrogen atoms in
solar flares are distributed according to the statistical weights
of the levels and that optical thickness in the high Balmer lines is
significantly less than unity. Calculations indicate that due to these
two conditions, the intensities of the high Balmer lines should fall
rapidly with number, which also leads to the small number of observed
lines in flares on the disk. The second-level population of hydrogen
atoms is estimated together with the extent of emission in flares.
Title: Contours of Emission Lines of Inhomogeneous Solar Formations
Authors: Kurochka, L. N.; Ostapenko, A. V.; Sugai, S. P.; Palus, P.
Bibcode: 1976BAICz..27..346K
Altcode:
It is shown that chromospheric flares and prominences are essentially
inhomogeneous and that the theoretical line profiles of these
phenomena have to be calculated taking this inhomogeneity into
account. In this case, the observed line profiles are in accordance
with the theoretical ones. Theoretical half-width curves of the line
profiles of inhomogeneous emission formations have been calculated
for different relative values of turbulent velocities in order to
determine the optical thicknesses.
Title: Emission line profiles of inhomogeneous solar formations.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1976opa..confQ..11K
Altcode:
No abstract at ADS
Title: Why few lines of the Balmer series are observed in flares on
the disk
Authors: Kurochka, L. N.; Sitnik, G. F.
Bibcode: 1975AZh....52..975K
Altcode:
It is shown that upper-level populations of hydrogen atoms in
solar flares are distributed according to the statistical weights
of the levels and that optical thickness in the high Balmer lines is
significantly less than unity. Calculations indicate that due to these
two conditions, the intensities of the high Balmer lines should fall
rapidly with number, which also leads to the small number of observed
lines in flares on the disk. The second-level population of hydrogen
atoms is estimated together with the extent of emission in flares.
Title: The last resolvable line in the hydrogen spectrum
Authors: Kurochka, L. N.
Bibcode: 1975SvA....18..526K
Altcode:
No abstract at ADS
Title: Radiation of Chromospheric Flares in Hydrogen Lines
Authors: Kurochka, L. N.; Kurochka, E. V.; Ostapenko, V. A.
Bibcode: 1975BAICz..26...23K
Altcode:
The energy radiated by flares of various classes in the Lyman, Balmer,
Paschen, and Brackett series are calculated for different optical
thicknesses of the flares. It is shown that the amount of energy
radiated in all the hydrogen lines is 4 to 5 times greater than that
radiated only in H-alpha. Statistical reduction of the observational
data yields the characteristic areas for flares of various classes,
the relative H-alpha line widths, the derived Doppler widths at the
maximum, lifetimes, and the relative number of flares of each class
on the sun. The characteristic time variations of the basic flare
parameters are determined, and an estimate is made of the total energy
radiated by flares of various classes. The total energy radiated by
flares of a particular class is shown to be approximately the same.
Title: Estimate of inhomogeneities of objects in calculating the
emission line profiles.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1975BSolD1975...96K
Altcode:
No abstract at ADS
Title: Calculation of the radiant energy of chromospheric flares.
Authors: Kurochka, L. N.; Kurochka, E. V.; Ostapenko, V. A.
Bibcode: 1975VeKie..17...12K
Altcode:
No abstract at ADS
Title: On the character of flare energy release on short-lived
sunspot groups.
Authors: Rossada, V. M.; Kurochka, L. N.
Bibcode: 1975BSolD1975...85R
Altcode:
No abstract at ADS
Title: The radiant energy and structure of chromospheric flares.
Authors: Kurochka, L. N.; Kurochka, E. V.; Ostapenko, V. A.
Bibcode: 1975VeKie..17...25K
Altcode:
No abstract at ADS
Title: The last resolvable line in the hydrogen spectrum
Authors: Kurochka, L. N.
Bibcode: 1974SvA....18..526K
Altcode:
A formula is derived which makes it possible to determine the electron
concentration in a plasma from the number of the extreme resolved line
when there is line broadening from the combined Stark effect and the
Doppler effect. The formula is applied to a series of hydrogen line
shapes, and the conditions for its validity are discussed.
Title: The last resolvable line in the hydrogen spectrum
Authors: Kurochka, L. N.
Bibcode: 1974AZh....51..892K
Altcode:
A formula is derived which makes it possible to determine the electron
concentration in a plasma from the number of the extreme resolved line
when there is line broadening from the combined Stark effect and the
Doppler effect. The formula is applied to a series of hydrogen line
shapes, and the conditions for its validity are discussed.
Title: On Lyman's Emission of Solar Flares
Authors: Křivsky, L.; Kurochka, L. N.
Bibcode: 1974BAICz..25...52K
Altcode:
No abstract at ADS
Title: On the Populations of Quantum Levels of Hydrogen Atoms in
Chromospheric Flares
Authors: Kurochka, E. V.; Kurochka, L. N.
Bibcode: 1973BAICz..24..132K
Altcode:
No abstract at ADS
Title: The emission of chromospheric flares in the ultraviolet and
infrared spectral regions.
Authors: Kurochka, E. V.; Kurochka, L. N.
Bibcode: 1973VeKie..15...10K
Altcode:
No abstract at ADS
Title: Spectrophotometry and analysis of intensive hydrogen and Ca
II lines in the spectrum of 30 chromospheric flares.
Authors: Stembkovskaya, T. V.; Kurochka, L. N.
Bibcode: 1973AAfz...19...70S
Altcode:
No abstract at ADS
Title: Saha's Equation under Deviation from Thermodynamic Equilibrium
Authors: Kurochka, L. N.
Bibcode: 1973BAICz..24..210K
Altcode:
No abstract at ADS
Title: Observations of the solar eclipse on July 10, 1972 by the
expedition of the Kiev Department of the Astronomical and Geodetical
Society.
Authors: Pyaskovskij, D. V.; Nesmyanovich, A. T.; Kurochka, L. N.
Bibcode: 1973ATsir.756....7P
Altcode:
No abstract at ADS
Title: Analysis of the weak chromospheric flare spectrum.
Authors: Kurochka, E.; Kurochka, L.; Stembkovskaya, T.
Bibcode: 1971BSolD1971R..87K
Altcode:
No abstract at ADS
Title: Electron Concentration and Structure of Chromospheric Flares.
Authors: Kurochka, L. N.
Bibcode: 1970SvA....14...89K
Altcode:
No abstract at ADS
Title: Electron Concentration and Structure of Chromospheric Flares.
Authors: Kurochka, L. N.
Bibcode: 1970AZh....47..111K
Altcode:
No abstract at ADS
Title: Determination of Electron Density in Plasma by the Number of
the Extreme Resolved Line
Authors: Kurochka, L. N.; Maslennikova, L. B.
Bibcode: 1970SoPh...11...33K
Altcode:
The paper shows that the dependence of the number of the extreme
resolved line on the electron density obtained for the Balmer series
(Kurochka, 1967) considering the broadening action of the electrons,
remains true for the Lyman and Paschen series as well. For these series
a formula which gives the dependence of the number of the extreme
resolved line on the velocity of hydrogen atoms when the lines are
broadened by the Doppler effect, has been derived.
Title: Spectrophotometric study of the chromospheric flare on
September 6, 1957.
Authors: Kurochka, L. N.; Ostapenko, V. A.
Bibcode: 1970BSolD1970..111K
Altcode:
No abstract at ADS
Title: The dependence of the number of the extreme resolved line of
Lyman series on electron density.
Authors: Kurochka, L. N.; Maslennikova, L. B.
Bibcode: 1970VeKie..12...25K
Altcode:
No abstract at ADS
Title: An Analysis of Hydrogen-Line Profiles Broadened by the Stark
and Doppler Effects.
Authors: Kurochka, L. N.
Bibcode: 1969SvA....13...64K
Altcode:
No abstract at ADS
Title: An Analysis of Hydrogen-Line Profiles Broadened by the Stark
and Doppler Effects.
Authors: Kurochka, L. N.
Bibcode: 1969AZh....46...85K
Altcode:
No abstract at ADS
Title: The last resolved line in the balmer series
Authors: Kurochka, L. N.
Bibcode: 1968Ap......4..240K
Altcode:
No abstract at ADS
Title: The last resolved line of Balmer series.
Authors: Kurochka, L. N.
Bibcode: 1968Afz.....4..581K
Altcode:
No abstract at ADS
Title: Stark Broadening of Hydrogen Lines.
Authors: Kurochka, L. N.
Bibcode: 1967SvA....11..290K
Altcode:
No abstract at ADS
Title: Stark Broadening of Hydrogen Lines.
Authors: Kurochka, L. N.
Bibcode: 1967AZh....44..368K
Altcode:
No abstract at ADS
Title: The Doppler effect and the last resolvable line of the
Balmer series
Authors: Kurochka, L. N.
Bibcode: 1966Ap......2...67K
Altcode:
No abstract at ADS
Title: Determination of electron density from emission lines of the
balmer series
Authors: Kurochka, L. N.
Bibcode: 1965Ap......1..195K
Altcode:
No abstract at ADS