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Author name code: slottje
ADS astronomy entries on 2022-09-14
author:Slottje, C.
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Title: Book reviews
Authors: Nieuwenhuijzen, H.; Israel, F. P.; Slottje, C.; Waters,
L. B. F. M.; Kleczek, J.; Werner, K.; Barylak, M.; Whitelock, Patricia;
Kresák, Ľ.; Meynet, G.; van der Hucht, K. A.; Stickland, D.
1993SSRv...62..393N Altcode:
No abstract at ADS
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Title: Book-Review - Tools of Radio Astronomy
Authors: Rohlfs, K.; Slottje, C.
1993SSRv...62..394R Altcode:
No abstract at ADS
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Title: Fine Structure in Solar Microwave Bursts
Authors: Allaart, M. A. F.; van Nieuwkoop, J.; Slottje, C.; Sondaar,
L. H.
1990SoPh..130..183A Altcode:
We have designed and constructed a new multi-channel radio spectrograph
for the study of short-lived structures in solar microwave bursts. It
measured the integrated flux over the whole solar disc in two circular
polarizations at 36 frequencies between 4 and 8 GHz, with a time
constant of 0.5 ms. We have analyzed all 119 recorded bursts observed
in 1981 and 1983. We focused our attention on events with a lifetime
of less than 1 s. Fine structure occurs in about 30% of the observed
bursts, and can be as rich in detail as in bursts observed at lower
frequencies. We found at least four different classes of events. In one
event neither bandwidth nor time resolution of the receiver appear to
be sufficient to resolve the fine structure. The bulk of the drifts
is found to be towards higher frequencies. Periodic flux variations
were found in two cases.
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Title: Dm-Spikes and Their Relation to Other Flare Phenomena in the
October 14, 1983 Event
Authors: Karlický, M.; Messerotti, M.; Ruždjak, V.; Slottje, C.;
Tlamicha, A.; Urpo, S.; Zlobec, P.
1987BAICz..38...42K Altcode:
By using observations in H-alpha and radio frequencies between 169
MHz and 37 GHz, the October 14, 1983 two ribbon flare was analysed. A
coherent picture of the event is given using the standard topology
for two-ribbon flares and describing the dm-spikes as manifestations
of electron acceleration in a reconnection process (with stationary
shock wave). The drifting chains of these spikes are explained by
the movement of this "stationary" shock wave. It is shown that the
behaviour with time of the number density of the spikes is in agreement
with that of the 37 GHz flux and hence that the same population of
accelerated electrons that gave rise to the spikes, also produced the
37 GHz radiation.
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Title: Book-Review - the Propagation of Radio Waves
Authors: Budden, K. G.; Slottje, C.
1986SSRv...44..184B Altcode:
No abstract at ADS
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Title: Book reviews
Authors: Gurtovenko, E. A.; Kostik, R. I.; Tlamicha, A.; Zerull, R.;
Schadee, Aert; Mészáros, A.; Néeman, Y.; Giese, R. H.; Sinclair,
A. T.; Kleczek, J.; Trendelenburg, E. A.; Hillebrandt, Wolfgang;
Sehnal, L.; de Graaff, W.; Slottje, C.; Courvisier, T.; van Beek,
H. F.; Baud, B.; de Jager, C.; Danby, J. M. A.; Somov, B. V.;
Cassinelli, J.; Verbunt, F.
1986SSRv...44..177G Altcode:
No abstract at ADS
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Title: Book reviews
Authors: Kleczek, J.; van Gent, R. H.; Rutten, Robert J.; de Munck,
J. C.; Slottje, C.; Severne, G.; Pecker, Jean-Claude; Postma, H.;
Grishchuk, L. P.; Niewenhuijzen, H.; Schuiling, R. D.; van Beek, H. F.;
Reijnen, G. C. M.; Heidmann, Jean; Lemaire, J.; Bleeker, Johan; Icke,
V.; Neéman, Y.; Feast, M. W.; de Graaff, W.
1986SSRv...43..383K Altcode:
No abstract at ADS
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Title: Book-Review - Radiotelescopes
Authors: Christiansen, W. H.; Hogbom, J. A.; Slottje, C.
1986SSRv...43..384C Altcode:
No abstract at ADS
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Title: Microwave, ultraviolet, and soft X-Ray observations of hale
region 16898
Authors: Shibasaki, K.; Chiuderi-Drago, F.; Melozzi, M.; Slottje,
C.; Antonucci, E.
1983SoPh...89..307S Altcode:
Hale region 16898 was observed by the Westerbork Synthesis
Radio Telescope at 6 cm and by the Ultraviolet Spectrometer and
Polarimeter and the X-Ray Spectrometer on the Solar Maximum Mission
satellite. Optical pictures of the same active region were taken at
Sacramento Peak, Big Bear, and Meudon Observatories. The radio emission
mechanisms are identified by comparing radio data with ultraviolet
and soft X-ray data. The height of the radio sources and the magnetic
field strength at that height are deduced. A radio source above a large
sunspot shows a crescent shaped depression of circular polarization and
a high brightness temperature. The emission mechanism is identified
as gyroresonance at the second and the third harmonic layers and it
is found that the second harmonic layer, where the magnetic field
strength is 900 G, must be in the corona. An extended loop-like source
connecting the leading and the following part of the active region
as well as the sources associated with small spots are mainly due
to thermal free-free emission by hot and dense plasma which is also
observed in ultraviolet and soft X-ray radiation. The calculated radio
brightness temperature, using the physical parameters deduced from the
ultraviolet and soft X-ray line intensities, agrees with the observed
brightness temperature. The height of the low brightness temperature
sources above the small spots is 6000 ± 3000 km and that above the
large spot is less than 3000 km: the source above the large spot
does not show any shift relative to the sunspot due to the projection
effect. Very strong radio emission was found which was associated with
the merging of a group of small spots into the large sunspot. In the
same day, warm (≤ 10<SUP>6</SUP> K) and dense matter was present
above the large spot. Evidence for nonthermal emission is presented.
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Title: X-ray, Hα, and radio observations of the two-ribbon flare
of 16 May, 1981
Authors: Fárník, F.; Kaastra, J.; Kálmán, B.; Karlický, M.;
Slottje, C.; Valniček, B.
1983SoPh...89..355F Altcode:
The paper is a contribution to the study of two-ribbon flares. A variety
of observational material, i.e. Hα pictures, radio spectrum in the
frequency band of 150-1000 MHz, radio map at 6 cm, fluxes at other
frequencies, magnetograms and X-ray flux in a broad energy interval,
enabled us to study the development of the 16 May, 1981 flare. The
onset of the flare could be described by the model of Van Tend and
Kuperus. A diminishing of the magnetic shear during the activation of
the filament was observed. From radio and X-ray data it was found that
pulsed acceleration took place in the region under the rising filament,
the electrons propagating in a limited region both upwards to greater
heights and downwards into the footpoints. Internal oscillations of
the filament were observed. A manifestation of the primary process of
interplanetary shock-wave generation was found. The 6 cm radio sources
could be localized in the footpoints of magnetic loops.
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Title: VLBI of solar flares
Authors: Tapping, K. F.; Kuijpers, J.; Kaastra, J. S.; van Nieuwkoop,
J.; Graham, D.; Slottje, C.
1983A&A...122..177T Altcode:
From April 28 to May 3, 1981, a VLBI experiment was carried out
to observe small spatial scales in the initial energy release
in solar flares. The 25 m radio telescope at Onsala (Sweden) and
Dwingeloo (Netherlands) were used; the observing wavelength was 18
cm. Simultaneous observations were made using the Westerbork Synthesis
Radio Telescope at a wavelength of 6 cm. The VLBI baseline was 619
km. During the observing period, three weak outbursts were observed,
none yielding any strong correlated signals. However, the statistical
behaviour of the correlator output over the range of delay channels
shows significant indications of a correlated signal having a signal
to noise ratio of order unity, during the impulsive spikes preceding
the main phase of the event.
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Title: Multiple Wavelength Observations of a Solar Active Region
Authors: Chiuderi-Drago, F.; Bandiera, R.; Willson, R. F.; Slottje,
C.; Falciani, R.; Antonucci, E.; Lang, K. R.; Shibasaki, K.
1982SoPh...80...71C Altcode:
The Solar Maximum Mission Satellite, the Sacramento Peak Vacuum
Tower Telescope, the Very Large Array and the Westerbork Synthesis
Radio Telescope have been used to observe active region AR 2490 on
two consecutive days at soft X-ray, ultraviolet, optical and radio
wavelengths (2, 6, and 20 cm), with comparable angular resolution
(2″ to 15″) and field of view (4' × 4'). The radio emissions at
λ = 6 cm and 20 cm show a double structure in which one component is
associated with bright Hα plage, C IV and soft X-ray emission, and
the other component is associated only with sunspots. No radiation at
λ = 2 cm is detected in this latter component. Coronal temperature
and emission measure derived from X-ray lines indicate that the
dominant radiation mechanism of the plage-associated component is
due to thermal bremsstrahlung while the gyroresonance absorption
coefficient must be invoked to account for the high brightness
temperature (T<SUB>b</SUB>≈2×10<SUP>6</SUP>K) observed in the
sunspot associated component. The high magnetic field strength needed
(600 G at a level where T∼2×10<SUP>6</SUP>K) is explained assuming
a thin transition zone, in order to reach a high electron temperature
close to the sunspot, where the magnetic fields are stronger. A higher
temperature gradient above sunspots is also consistent with the absence
of detectable C IV emission.
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Title: The Relation Between the Surges and Solar Radio Emission
Authors: Garczynska, I. N.; Rompolt, B.; Benz, A. O.; Slottje, C.;
Tlamicha, A.; Zanelli, C.
1982SoPh...77..277G Altcode:
The 120 limb surges which have been observed by means of Wrocław
Observatory coronagraph from September 1966 to November 1977 are
investigated. The evolution of surges was compared with the radio
data during the surges. A correlation between radio bursts and the
surges was found, particularly with chains of type I radio bursts,
which is the first reliable correlation found of these bursts with
non-radio events. The type I correlation only applied for surges
without accompanying flare, of which 43% are correlated with this type
of radio emission. In 23 of 30 associated events the start of a surge
coincided within 5 minutes with the start or an enhancement of the type
I storm. If flares were present, the association was not significant.
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Title: Atlas of fine structures of dynamic spectra
Authors: Slottje, Cornelis
1982PhDT.......179S Altcode:
No abstract at ADS
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Title: Runaway acceleration in a radio flare
Authors: Kuijpers, J.; van der Post, P.; Slottje, C.
1981A&A...103..331K Altcode:
Radio observations of a solar flare are explained by induced electric
fields in several small regions within a flaring flux tube. In each
acceleration region runaway electrons are produced which lead to
a pulsed production of high-frequency plasma waves. The model is
used for an accurate determination of the physical conditions in the
flare. During the runaway process an essential fraction of the runaway
energy is put into plasma waves. The required electric field strength
is of order E/E<SUB>c</SUB> approximately equal to 0.1 (E<SUB>c</SUB>
is twice the Dreicer field) and the ratio of electron cyclotron to
plasma frequency is of order unity or larger.
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Title: Simultaneous Calibration of Solar Radio Instruments from
Decimetre to Decametre Wavelengths
Authors: Elgaroy, O.; Slottje, C.; Tlamicha, A.; Urbarz, H.; Zanelli,
C.; Zlobec, P.; Bougeret, J. L.; Kerdraon, A.; de La Noe, J.
1981A&AS...44..165E Altcode:
Simultaneous calibration of about 15 solar radio instruments in Europe
on a day when the spectrum of the solar radio emission was stable snows
satisfactory concordance despite the diversity of the instruments and
the use of various methods of calibration. <P />The results obtained
will serve as a common basis for the study of noise storm continua -
and also of other radio spectra - in the dm-dam wavelength range.
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Title: Fast fine structure in solar microwave flares
Authors: Slottje, C.
1980IAUS...86..195S Altcode:
A preliminary account is presented of some characteristics of Fast
Fine Structure, that is fine structure with time scales in the
millisecond range, and of the flare events in which the appear. Fast
Fine Structure is found to be a fairly common phenomenon that could,
but not necessarily does, appear in flare events of any importance
occurring at any longitude. It may occur with any type of microwave
burst (except most likely 'Rise' and 'Fall'). It appears more often in
the more important events and it may last for only a few seconds up
to many minutes. Fast Fine Structure may have any degree of circular
polarization, apparently independent of its longitude position.
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Title: Millisecond microwave spikes in a solar flare
Authors: Slottje, C.
1978Natur.275..520S Altcode:
THE shortest-lived structures in microwave solar flares known until
now last ~1 s. Recently (11 April 1978) we observed a microwave
outburst at 2.65 GHz (starting at 13.41 UT) showing a strong and
extremely fast fluctuating burst component. Many spikes appeared to
have half-power durations smaller than the 20-ms resolution of the
instrument used. These are about two orders of magnitude shorter-lived
than events reported from previous microwave observations. They are
only rivalled by fine structure in some decimetric type IV bursts
between 0.4 and 1.4GHz (ref. 1).
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Title: Polarization and location of metric radiobursts in relationship
with the emergence of a new magnetic field.
Authors: Heyvaerts, J.; Kerdraon, A.; Mangeney, A.; Pick, M.;
Slottje, C.
1978A&A....66...81H Altcode:
Spike bursts have been observed in association with some solar type III
burst groups. In this event, the spikes appear according to bandwidth
and duration to be mini type I bursts. Their circular polarization
cannot be explained by emission of the ordinary mode in the magnetic
field of the dominant photospheric polarity. This observation is
interpreted by the expansion at 0.3 solar radii of magnetic loops
related to the emergence of a satellite polarity. A coronal-field
model is proposed for the whole active center. Application of the
theory of Mangeney and Veltri (1976) for type I bursts leads to a
consistent picture of the generation of these spikes.
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Title: The quiet solar background between 160 and 320 MHz. Calibrated
measurements with the 60-channel radio spectrograph at Dwingeloo
Authors: Slottje, C.
1978cesra...7...35S Altcode:
No abstract at ADS
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Title: Some spectra of noise storm continua between 160 and 320 MHz
during August 1976
Authors: Slottje, C.
1978cesra...7...33S Altcode:
No abstract at ADS
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Title: Some measurements of noise storm brightness temperatures at
243 MHz
Authors: Slottje, C.
1978cesra...7...38S Altcode:
No abstract at ADS
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Title: The "Continuum group"
Authors: Slottje, C.
1978cesra...7...49S Altcode:
No abstract at ADS
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Title: Chains of type I stormbursts.
Authors: de Groot, T.; Loonen, J.; Slottje, C.
1976SoPh...48..321D Altcode:
From radio spectra between 160 and 320 MHz of chains of type I bursts
it appears that their duration distributions allow an exponential fit,
and that those of samples containing long and short chains respectively,
taken from the same storm, have virtually the same characteristic
time (logarithmic slope). On the average this figure decreases - as a
function of the frequency - at about 1 s per 10 MHz. The high frequency
cut-off of chain activity (noise storms) is mainly a consequence of
the frequency dependence of the probability for the first burst of
a chain to appear. Given the density of type I bursts in a chain,
it is concluded that the probability of a type I burst to be followed
by another one is at least 90% below 250 MHz and 70-80% at 300 MHz,
which makes it essential for type I theories to include a mechanism
to this effect. The drift rate distribution for chains is symmetrical
with a peak at-10 MHz/s. The statistics is indicative of a correlation
between drift rate and duration. No evidence has been found for the
occurrence of chain pairs or frequency splitting in chains, nor for
an association between chains and type III bursts.
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Title: Fiber burst concurrent with a weak noise storm.
Authors: Kuijpers, J.; Slottje, C.
1976SoPh...46..247K Altcode:
A new kind of radio burst is described and identified as quasi-fiber
burst according to some striking similarities with fiber bursts. Its
interpretation is discussed in terms of Kuijpers' whistler model and an
explanation for a broken variety of. the observed burst is given. The
derived magnetic field strength in the source is 4 G at a plasma level
of 300 MHz.
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Title: Polarization Fine Structure in Solar Radiobursts of Type III
on Short Meter Wavelengths
Authors: Slottje, C.
1974A&A....32..107S Altcode:
Summary. Accurately calibrated measurements with the 60-Channels Solar
Radiospectrograph, now operated at Dwingeloo between 315 and 200 MHz,
led to the discovery of finestructure in the timeprofile of the degree
of polarization of some Type III bursts: after a short peak of very
high values the polarization drops to about 10% while the intensity
increases to its maximum. This behaviour is in agreement with a model
given by Fomichev and Chertok. A more sophisticated model enables to
deduce from the observed polarization profile and frequency driftrate,
consistent values for the magnetic field strength in the source, the
density gradient of the ambient plasma and the exciter speed. As the
model predicts a different polarization profile for fundamental and
harmonic radiation respectively the bursts of the present case are
identified as fundamental radiation. Key words: Sun - radiobursts -
type III - polarization
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Title: High Resolution Studies of Type III Solar Radio Bursts
(presented by H. Rosenberg)
Authors: Chiuderi, C.; Giachetti, R.; Mercier, C.; Rosenberg, H.;
Slottje, C.
1974IAUS...57..225C Altcode:
No abstract at ADS
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Title: Fine Structure in Type IV Solar Radio Bursts (presented by
H. Rosenberg)
Authors: Caroubalos, C.; Pick, M.; Chiuderi, C.; Giachetti, R.;
Rosenberg, H.; Slottje, C.
1974IAUS...57..291C Altcode:
No abstract at ADS
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Title: Polarization Fine Structure of Type III Solar Radio Bursts
on Short Meter Wavelengths and its Relation to the Nature of the
Radiation and Source Parameters
Authors: Slottje, C.
1974cesra...4...71S Altcode:
No abstract at ADS
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Title: A High Resolution Study in Times, Position, Intensity, and
Frequency of the Radio Event of January 14, 1971
Authors: Caroubalos, C.; Pick, M.; Rosenberg, H.; Slottje, C.
1973SoPh...30..473C Altcode:
A high resolution study in time, frequency, position, and intensity
was made at 169 MHz and neighbouring frequencies of the solar radio
event of 1971, January 14, 11<SUP>h</SUP> 20<SUP>m</SUP>-30<SUP>m</SUP>
UT. The event consisted of two closely resembling groups of type III
bursts and type II like details.
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Title: A High Resolution Study in Time, Position, Intensity, and
Frequency of a Radio Event on January 14, 1971
Authors: Caroubalos, C.; Pick, M.; Rosenberg, H.; Slottje, C.
1973NASSP.342..610C Altcode: 1973heps.conf..610C
No abstract at ADS
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Title: Addendum: "Peculiar absorption and emission microstructures
in the type IV solar radio outburst of March 2, 1970" [Sol. Phys.,
Vol. 25, p. 210 - 231 (1972)].
Authors: Slottje, C.
1972SoPh...26..259S Altcode:
No abstract at ADS
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Title: Peculiar absorption and emission microstructures in the type
IV solar radio outburst of March 2, 1970
Authors: Slottje, C.
1972SoPh...25..210S Altcode:
The high resolution dynamic spectrogram between 320 and 160 MHz of the
Type IV event which started at 13∶35 UT on the 2nd of March 1970 shows
a remarkable richness of absorption-emission microstructures. These
are morphologically analyzed into structure elements and patterns. The
elements are normal and reversed intermediate drift bursts, which
we call fiber bursts, medium band shortlived absorptions, broadband
shortlived absorptions, broadband wedge shaped absorptions and a,
sofar unknown, type which we call tadpole. The patterns are the
pulsating structure, sequences of broadband shortlived absorptions,
and patterns of almost parallel lines which we call zebra patterns.
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Title: First results of digitally recording radiospectra with the
60-channel radio spectrograph
Authors: Slottje, C.
1972cesra...3..159S Altcode:
No abstract at ADS
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Title: A high resolution study in time, position, intensity and
frequency of a radio event on January 14, 1971
Authors: Caroubalos, C.; Pick, M.; Rosenberg, H.; Slottje, C.
1972cesra...3..162C Altcode:
No abstract at ADS
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Title: A new site for the solar radio observations in the Netherlands
Authors: Slottje, C.
1972cesra...3..216S Altcode:
No abstract at ADS
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Title: Fine structure in spectra of solar radio bursts
Authors: Slottje, C.
1972ppsr.conf..245S Altcode:
No abstract at ADS
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Title: Peculiar absorption and emission microstructures in a Type
IV solar radio outburst
Authors: Slottje, C.
1971cesra...1...40S Altcode:
No abstract at ADS
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Title: Zebra patterns in solar type IV radio bursts
Authors: Slottje, C.
1971cesra...2...88S Altcode:
No abstract at ADS
