Author name code: ivanov
ADS astronomy entries on 2022-09-14
=author:"Ivanov, V.V."
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Title: METEOR-L Device on the Lunar Orbital Vehicle Luna-26: Space
Dust Detector
Authors: Slyuta, E. N.; Vysochkin, V. V.; Ivanov, V. V.; Makovchuk,
V. Yu.; Nazarov, A. I.; Pogonin, V. I.; Roskina, E. A.; Safronov,
V. V.; Tatsiy, L. P.
Bibcode: 2021SoSyR..55..437S
Altcode:
The ionization-type cosmic dust detector METEOR-L is being
developed for the lunar orbiter Luna-26 and is designed to study
the distribution of meteoric bodies in space by mass and velocity,
and for long-term monitoring of the dynamic evolution of the dust
component in the lunar exosphere. Recent studies of dust clouds around
the Moon show a close relationship between the constant and dynamic
evolution of the components of the lunar exosphere, the geological
history of the formation of the lunar regolith, the processes
of formation and accumulation of volatiles in the lunar regolith
with the constant impact of such components of the interplanetary
medium as interplanetary dust of predominantly cometary origin and
meteoroids from the belt asteroids. The cosmic dust detector is
capable of registering meteoric particles 0.1-3 μm in size with a
mass of 10-14-10-9 g and speeds from 3 to 35 km
s-1. Tests and calibration at a particle accelerator have
confirmed the declared functionality of the detector for detecting
cosmic dust particles with parameters characteristic of the lunar
exosphere.
Title: TERMO-LR Experiment on the Luna-27 Lander: Study of
Thermophysical, Physicomechanical, and Electromagnetic Properties
of the Lunar Soil
Authors: Slyuta, E. N.; Marov, M. Ya.; Dunchenko, A. G.; Makovchuk,
V. Yu.; Morozov, O. V.; Nazarov, A. I.; Ivanov, V. V.; Pogonin, V. I.;
Roskina, E. G.; Safronov, V. V.; Kharlov, B. N.; Tatsiy, L. P.
Bibcode: 2021SoSyR..55..446S
Altcode:
The device is being developed for the TERMO-LR experiment on the Luna-27
lunar lander; it is intended for contact geophysical measurements of
various properties of the lunar soil on the surface and at a depth up
to 3 m. We consider the scientific tasks of the experiment regarding
the study of physicomechanical (density, mechanical and deformation
characteristics), thermophysical (thermal conductivity, heat capacity),
and electromagnetic (dielectric permittivity, magnetic susceptibility)
properties of the lunar soil and the internal heat flow of the Moon. A
description of the design and technical characteristics, functional
diagram and operating modes of the device, which consists of three main
units: a depth measurement unit with a deep logging probe, a surface
measurement unit, and an electronics unit, are given. The logging probe
includes a self-deepening penetrator hammer, a dielectric permittivity
sensor, a magnetic susceptibility sensor, and a tape with temeprature
sensors for measuring the temperature distribution in the soil and
internal heat flow. The surface measurement unit includes temperature
sensors for measuring the thermophysical properties of the lunar soil
on the surface in passive and active modes. The tests and calibration
of temperature sensors of the surface measurement unit are considered,
which have confirmed the high performance characteristics of the sensor
and the reliability of the measurement interpretation.
Title: Spectral analysis of the multiple-altitude anomalous
geomagnetic field
Authors: Tsvetkov, Yu. P.; Ivanov, V. V.; Petrov, V. G.; Filippov,
S. V.; Brekhov, O. M.
Bibcode: 2016Ge&Ae..56..774T
Altcode:
The spectra of the anomalous geomagnetic field measured at ground and
balloon (30 km) altitudes were analyzed. The ground-based data were
adapted from a map of the anomalous magnetic field of the Earth. A
balloon surveys was carried out by the authors. It has been shown that
the ground and balloon spectra of the anomalous magnetic field of the
Earth substantially differ. Suppositions explaining the differences
in the obtained spectra have been suggested.
Title: A physical algorithm to measure sea ice concentration from
passive microwave remote sensing data
Authors: Tikhonov, V. V.; Repina, I. A.; Raev, M. D.; Sharkov, E. A.;
Ivanov, V. V.; Boyarskii, D. A.; Alexeeva, T. A.; Komarova, N. Yu.
Bibcode: 2015AdSpR..56.1578T
Altcode:
A conceptually new algorithm of sea ice concentration retrieval
in polar regions from satellite microwave radiometry data is
discussed. The algorithm design favorably contrasts with that of
known modern algorithms. Its design is based on a physical emission
model of the "sea surface - sea ice - snow cover - atmosphere"
system. No tie-points are used in the algorithm. All the calculation
expressions are derived from theoretical modeling. The design of the
algorithm minimizes the impact of atmospheric variability on sea ice
concentration retrieval. Beside estimating sea ice concentration,
the algorithm makes it possible to indicate ice areas with melting
snow and melt ponds. The algorithm is simple to use, no complicated
or time consuming calculations are involved.
Title: Role Stratospheric Balloon Magnetic Surveys in Development
of Analytical Global Models of the Geomagnetic Field
Authors: Brekhov, O. M.; Tsvetkov, Yu. P.; Ivanov, V. V.; Filippov,
S. V.; Tsvetkova, N. M.
Bibcode: 2015ESASP.730..357B
Altcode:
The results of stratospheric balloon gradient geomagnetic surveys at
an altitude of ‘-~3O km with the use of the long (6 km) measuring
base oriented along the vertical line are considered. The purposes
of these surveys are the study of the magnetic field formed by deep
sources, and the estimation of errors in modern analytical models of
the geomagnetic field. The independent method of determination of
errors in global analytical models of the normal magnetic field of
the Earth (MFE) is substantiated. The new technique of identification
of magnetic anomalies from surveys on long routes is considered. The
analysis of gradient magnetic surveys on board the balloon, revealed
the previously unknown features of the geomagnetic field. Using
the balloon data, the EMM/720 model of the geomagnetic field
(http://www.ngdc.noaa.gov/geomag/EMM) is investigated, and it is shown
that this model unsatisfactorily represents the anomalous MFE, at least,
at an altitude of 30 km, in the area our surveys. The unsatisfactory
quality of aeromagnetic (ground-based) data is also revealed by the
method of wavelet analysis of the ground-based and balloon magnetic
profiles. It is shown, that the ground-based profiles do not contain
inhomogeneities more than 1 30 km in size, whereas the balloon profiles
(1000 km in the strike extent) contain inhomogeneities up to 600 km
in size an the location of the latte coincides with the location of
the satellite magnetic anomaly. On the basis of balloon data is shown,
it that low-altitude aeromagnetic surveys, due to fundamental reasons,
incorrectly reproduce the magnetic field of deep sources. This prevents
the reliable conversion of ground-based magnetic anomalies upward
from the surface of the Earth. It is shown, that an adequate global
model of magnetic anomalies in the circumterrestrial space, developed
up to 720 spherical harmonics, must be constructed only in accordance
with the data obtained at satellite and stratospheric altitudes. Such
a model can serve as a basis for the refined study of the structure
and magnetic properties of the Earth's crust at its deep horizons,
in order to search for resources at them, and so on.
Title: Dynamics and physical model of secular variations within a
range of up to 100 years
Authors: Ivanov, V. V.; Bondar, T. N.
Bibcode: 2015Ge&Ae..55..389I
Altcode:
The frequency-time and spatial characteristics of secular variations
have been studied within a range of up to 100 years. It has been
revealed that the variations intensify and the intervals between
intensifications substantially differ. A physical model of the secular
variations was proposed for a range of up to 100 years. It explains
these specific features in the variation dynamics and takes into
account the fact that the outer core viscosity is nonzero and that
the difference in density between the floating structures and outer
core is small and is comparable with the variations in the floating
structure densities.
Title: Outer radiation belt of relativistic electrons during the
minimum of the 23rd solar cycle
Authors: Tverskaya, L. V.; Balashov, S. V.; Veden'kin, N. N.; Ivanov,
V. V.; Karpenko, D. S.; Kochura, S. G.; Maksimov, I. A.; Open'ko,
S. I.; Pavlov, N. N.; Reizman, S. Ya.; Rubinshtein, I. A.; Sitnokova,
N. N.; Tel'tsov, M. V.; Trofimchuk, D. A.; Tulupov, V. I.
Bibcode: 2012Ge&Ae..52..740T
Altcode:
The data on fluxes of electrons with energy Ee > 1 MeV and on
radiation doses under the Al shielding of about 2 g/cm2
measured on the GLONASS satellite (circular orbit with altitude 20000
km and inclination 65°) for the period from December 2006 through May
2010 are analyzed. The minimum of the 23rd solar cycle turned out to
be the longest for all over the space exploration age. Consequently,
average semiannual electron fluxes and daily radiation doses are
showing the decrease by more than an order of magnitude in comparison
with the levels observed in 2007. We present an example of a diffusion
wave of relativistic electrons; the wave develops in a period between
magnetic storms. This process may result in a significant increase of
the radiation dose measured in the orbit, even under the conditions
of weak geomagnetic disturbances. The dynamics of variations in
relativistic electron fluxes during the magnetic storm of April 5-6,
2010, is discussed so far as this is the first strong flux enhancement
in the 24th solar cycle.
Title: Wavelet analysis of the fine structure of jerks by mean monthly
variations in the magnetic field in the period from 1955 to 2006
Authors: Ivanov, V. V.; Bondar', T. N.
Bibcode: 2012Ge&Ae..52..664I
Altcode:
A wavelet analysis of mean monthly variations in time series of the
geomagnetic field at the Niemegk magnetic observatory for the period
from January 1, 1955, to December 31, 2006, has been performed. The
temporal and frequency characteristics of jerks that were detected
during this period are compared by mean yearly and monthly data. The
processes that cause the jerk phenomenon are shown to have a complicated
spatiotemporal structure, which differs significantly from case to
case. The characteristic temporal scales of the processes causing the
jerk phenomenon are various and lie within the limits from several
months to more than a hundred months.
Title: Investigation of flute instability in application to laboratory
astrophysics and Z-pinch experiments
Authors: Sotnikov, V. I.; Ivanov, V. V.; Presura, R.; Yassin, E.;
Kindel, J.; Leboeuf, J. N.; Onishchenko, O. G.; Oliver, B. V.; Jones,
B.; Mehlhorn, T. A.; Deeney, C.
Bibcode: 2009Ap&SS.322..209S
Altcode: 2009Ap&SS.tmp...25S
Interaction of plasma flows with magnetic fields can lead to excitation
of flute-like oscillations. These oscillations can also be excited in
Z-pinch plasmas. We have developed understanding of nonlinear dynamics
of compressible flute mode turbulence with spatial scales comparable
to the ion Larmor radius in a high beta plasma, when these modes become
electromagnetic and in the presence of a non-uniform magnetic field. It
is shown that the flute waves are responsible for generation of large
scale structures of streamer and zonal flow types as well as Kolmogorov
type spectra in the short scale region. The relevance of the obtained
results to laboratory astrophysics and Z-pinch experiments is discussed.
Title: Rayleigh scattering: Volterra equation for the matrix source
function
Authors: Ivanov, V. V.
Bibcode: 2009Ap.....52..276I
Altcode: 2009Ap....tmp...26I
No abstract at ADS
Title: Multiple light scattering: mean number of scatterings and
related problems
Authors: Ivanov, V. V.
Bibcode: 2009Ap.....52...24I
Altcode: 2009Ap....tmp...12I; 2009Ap....tmp...24I
No abstract at ADS
Title: Solar proton increases and dynamics of the electron outer
radiation belt during solar events in December 2006
Authors: Tverskaya, L. V.; Balashov, S. V.; Vedenkin, N. N.; Ivanov,
V. V.; Ivanova, T. A.; Karpenko, D. S.; Kochura, S. G.; Maksimov,
I. A.; Pavlov, N. N.; Rubinstein, I. A.; Tel'Tsov, M. V.; Trofimchuk,
D. A.; Tulupov, V. I.; Khartov, V. V.
Bibcode: 2008Ge&Ae..48..719T
Altcode:
Increases in solar protons and variations in the electron and proton
fluxes from the outer radiation belt are studied based on the GLONASS
satellite measurements (the circular orbit at an altitude of ∼20000 km
with an inclination of ∼65°) performed in December 2006. Indications
in the channels, registered protons with energies of Ep = 3-70 MeV
and electrons with energies of Ee > 0.04 and >0.8 MeV, are
analyzed. The data on electrons with Ee = 0.8-1.2 MeV, measured on
the Express-A3 geostationary satellite, are also presented. Before the
strong magnetic storm of December 14 (| Dst|max = 146 nT),
the maximum of the outer belt electrons with the energy >0.7 MeV was
observed at L ∼ 4.5. After the storm, the fluxes of these electrons
increased by more than an order of magnitude as compared to the prestorm
level, and the maximum of a “new” belt shifted to L < 4 (minimal
L reached by the GLONASS orbit). Under quiet geomagnetic conditions,
solar protons with the energies >3 MeV fill only high-latitude legs
of the GLONASS orbit. During the strong magnetic storm of December 15,
the boundary of proton penetration into the magnetosphere almost merged
with the orbital maximum of the proton radiation belt.
Title: Wavelet analysis of temporal and spatial parameters of the
60-year variation in the geomagnetic field
Authors: Ivanov, V. V.; Bondar', T. N.
Bibcode: 2008Ge&Ae..48..680I
Altcode:
A wavelet analysis and statistical processing of its results have been
performed for the series of geomagnetic data at several observatories
in Europe, Asia, and North America. It has been noted that the sources
of 60-year variations in the geomagnetic field can be divided into
two classes with respect to spatial scales. It has been indicated that
the sources of these variations are anisotropic. It has been proposed
that these variations can be caused by the reconstruction of motions
on the surface of the Earth’s liquid core.
Title: Seasonal and diurnal variations in atmospheric pressure
Authors: Ivanov, V. V.
Bibcode: 2007IzAOP..43..323I
Altcode:
The Laplace idea of the description of tides is used for the
representation of seasonal-diurnal variations in atmospheric
pressure. The variations are represented as the sum of pure periodic
processes whose frequencies coincide with combinations of astronomical
frequencies and whose amplitudes and phases are determined with
the use of spectral analysis of observed variations. Combinations
of the frequencies of the Earth’s rotation and orbital motion are
used as the astronomical frequencies. The idea is tested on the data
of atmospheric pressure and temperature observations at the Ternei
site. These data are compared to the observations of atmospheric
tides associated with the gravitational pull of the Moon. It is found
that the pressure and temperature seasonal variations associated
with solar radiation exceed solar tides by tens of times and can
be used for the description of such phenomena as cyclones and season
changes. Analysis of atmospheric lunar tides has shown that these tides
are also responsible for atmospheric temperature variations, which
are in antiphase with pressure variations. The ratios of the phases
of temperature and pressure variations are the same in seasonal and
tidal variations. It seems likely that seasonal variations and tides
propagate along the Earth’s surface as a wave that accompanies the
surface motion of the spherical projection of the Sun in the first
case and the Moon in the second case.
Title: Polarized line formation by resonance scattering: Lorentz
profile
Authors: Loskutov, V. M.; Ivanov, V. V.
Bibcode: 2007Ap.....50..157L
Altcode:
Multiple resonance scattering of spectral line radiation is examined
in atmospheres with uniformly distributed sources of unpolarized
radiation. It is assumed that the profile of the absorption
coefficient is lorentzian and that scattering involves complete
frequency redistribution. The polarization characteristics of the
emerging radiation are determined by iterative solution of a nonlinear
Ambartsumyan-Chandrasekhar matrix integral equation. In particular,
it is found that for pure scattering the maximum polarization at the
limb of the disk is 5.421%. The polarization characteristics of the
emerging radiation are compared for three different absorption profiles:
Lorentz, Doppler, and rectangular (monochromatic radiation).
Title: Excitation of Electromagnetic Flute Modes in the Process of
Interaction of Plasma Flow with Inhomogeneous Magnetic Field
Authors: Sotnikov, V. I.; Presura, R.; Ivanov, V. V.; Cowan, T. E.;
Leboeuf, J. N.; Oliver, B. V.
Bibcode: 2007Ap&SS.307...99S
Altcode: 2006Ap&SS.tmp..572S
Laboratory experiments on the interaction of a plasma flow, produced
by laser ablation of a solid target with the inhomogeneous magnetic
field from the Zebra pulsed power generator demonstrated the presence
of strong wave activity in the region of the flow deceleration. The
deceleration of the plasma flow can be interpreted as the appearance
of a gravity-like force. The drift due to this force can lead to the
excitation of flute modes. In this paper a linear dispersion equation
for the excitation of electromagnetic flute-type modes with plasma and
magnetic field parameters, corresponding to the ongoing experiments
is examined. Results indicate that the wavelength of the excited
flute modes strongly depends on the strength of the external magnetic
field. For magnetic field strengths ∼0.1 MG the excited wavelengths
are larger than the width of the laser ablated plasma plume and cannot
be observed during the experiment. But for magnetic field strengths ∼1
MG the excited wavelengths are much smaller and can then be detected.
Title: Laboratory simulation of magnetospheric plasma shocks
Authors: Horton, W.; Chiu, C.; Ditmire, T.; Valanju, P.; Presura, R.;
Ivanov, V. V.; Sentoku, Y.; Sotnikov, V. I.; Esaulov, A.; Le Galloudec,
N.; Cowan, T. E.; Doxas, I.
Bibcode: 2007AdSpR..39..358H
Altcode:
Laboratory experiments using a plasma wind generated by laser-target
interaction are developed to investigate the creation of a shock in
front of the magnetosphere and the dynamo mechanism. Magnetic obstacles
are placed in the plasma wind and measurements of the electron density
gradients surrounding the obstacles are recorded. The experiments
are analyzed with the methods used in theoretical simulation of the
solar-wind-driven magnetosphere interactions. The proposed experiments
are thought to be relevant to understanding the electron acceleration
mechanisms at work in shock-driven magnetic dipole confined plasma
surrounding compact magnetized stars and planets. Electron shock
acceleration mechanisms are discussed in some detail.
Title: Memory of the scientist: Vitaly Gerasimovich Gorbatsky
(1920-2005)
Authors: Ivanov, V. V.
Bibcode: 2006IAIss..31..333I
Altcode:
No abstract at ADS
Title: Laboratory Simulation of Magnetospheric Plasma Shocks
Authors: Presura, R.; Ivanov, V. V.; Sentoku, Y.; Sotnikov, V. I.;
Laca, P. J.; Galloudec, N.; Kemp, A.; Mancini, R.; Ruhl, H.;
Astanovitskiy, A. L.; Cowan, T. E.; Ditmire, T.; Chiu, C.; Horton,
W.; Valanju, P.; Keely, S.
Bibcode: 2005Ap&SS.298..299P
Altcode:
An experimental simulation of planetary magnetospheres is being
developed to investigate the formation of collisionless shocks and
their effects. Two experimental situations are considered. In both,
the solar wind is simulated by laser ablation plasmas. In one case,
the “solar wind” flows across the magnetic field of a high-current
discharge. In the other, a transverse magnetic field is embedded
in the plasma flow, which interacts with a conductive obstacle. The
ablation plasma is created using the “Tomcat” laser, currently
emitting 5 J in a 6 ns pulse at 1 μm wavelength and irradiance above
1013 W/cm2. The “Zebra” z-pinch generator,
with load current up to 1 MA and voltage up to 3.5 MV produces the
magnetic fields. Hydrodynamic modeling is used to estimate the plasma
parameters achievable at the front of the plasma flow and to optimize
the experiment design. Particle-in-cell simulations reveal details
of the interaction of the “solar wind” with an external magnetic
field, including flow collimation and heating effects at the stopping
point. Hybrid simulations show the formation of a bow shock at the
interaction of a magnetized plasma flow with a conductor. The plasma
density and the embedded field have characteristic spatial modulations
in the shock region, with abrupt jumps and fine structure on the skin
depth scale.
Title: Laboratory Simulation of Magnetospheric Plasma Shocks
Authors: Presura, R.; Ivanov, V. V.; Sentoku, Y.; Sotnikov, V. I.;
Laca, P. J.; Le Galloudec, N.; Kemp, A.; Mancini, R.; Ruhl, H.;
Astanovitskiy, A. L.; Cowan, T. E.; Ditmire, T.; Chiu, C.; Horton,
W.; Valanju, P.; Keely, S.
Bibcode: 2005hedl.book..299P
Altcode:
An experimental simulation of planetary magnetospheres is being
developed to investigate the formation of collisionless shocks and
their effects. Two experimental situations are considered. In both,
the solar wind is simulated by laser ablation plasmas. In one case,
the "solar wind" flows across the magnetic field of a high-current
discharge. In the other, a transverse magnetic field is embedded in
the plasma flow, which interacts with a conductive obstacle. The
ablation plasma is created using the "Tomcat" laser, currently
emitting 5J in a 6 ns pulse at 1μm wavelength and irradiance above
1013 W/cm2. The "Zebra" z-pinch generator,
with load current up to 1 MA and voltage up to 3.5 MV produces the
magnetic fields. Hydrodynamic modeling is used to estimate the plasma
parameters achievable at the front of the plasma flow and to optimize
the experiment design. Particle-in-cell simulations reveal details
of the interaction of the "solar wind" with an external magnetic
field, including flow collimation and heating effects at the stopping
point. Hybrid simulations show the formation of a bow shock at the
interaction of a magnetized plasma flow with a conductor. The plasma
density and the embedded field have characteristic spatial modulations
in the shock region, with abrupt jumps and fine structure on the skin
depth scale.
Title: Simulation of Erosion and Contamination of Spacecraft Surfaces
Induced by Plasma Thruster Jet
Authors: Nadiradze, A. B.; Arbatsky, V. M.; Shaposhnikov, V. V.;
Parshina, E. B.; Khartov, V. V.; Maksimov, I. A.; Ivanov, V. V.;
Balashov, S. V.; Galitsky, S. S.
Bibcode: 2004ESASP.555E.102N
Altcode: 2004sppr.confE.102N
Theoretical and experimental results permitting to predict erosion
and contaminating effects induced by plasma thruster jet are
presented. Numerical models, describing main phenomena of jet-surface
interaction, are described. In particular, fluence impact on sputtering
performance, microrelief formation, various mechanisms of the sputtered
material mass transfer are considered. Experimental techniques to
determine interaction parameters - sputtering coefficients and
indicatrix as a function of a fluence and ion incidental angle
- are developed. The investigation has been carried out on MAI
(Moscow Aviation Institute) test facility (Department 208 - Electro
propulsion and Space power plants). The test facility has vacuum
chamber with 2 m3 , ion source (different type ions), diagnostic
equipment, specially designed for this type of the investigation. The
results of the investigations were used in the spacecraft designing
done by NPO PM. In particular, using obtained information, it was
calculated needed strengthening of outer layer of the SC SESAT screen-
vacuum isolation, securing its resistance ability in the thruster's
jet. Developed procedures can be used for any type of the SC, on board
which a plasma thruster is used.
Title: Variations of the gravitational field as a motive power for
rhythmics of biochemical processes
Authors: Troshichev, O. A.; Gorshkov, E. S.; Shapovalov, S. N.;
Sokolovskii, V. V.; Ivanov, V. V.; Vorobeitchikov, V. M.
Bibcode: 2004AdSpR..34.1619T
Altcode:
Variations of the gravitational field affected by the Sun and the Moon
while the Earth's moving along the orbit seem to be a powerful source
of many rhythmical processes typical of biochemical processes. Studies
carried out in AARI revealed the obvious relationships between the
dynamics of some biochemical reactions and λD- function
describing the regular variations of the gravitational field under
combined influence of the Sun and the Moon. The following of them
are examined as examples: the rate of the unithiol oxidation in
vitro, concentration of the thiol compounds in human urine, some
hematological indicators (rate of the erythrocytes sedimentation,
hemoglobin content). Compatibility of run of the biochemical indicators
and λD-function is indicative of essential influence of
the regular variations of the gravitational field on rhythmics of the
biochemical processes. As this takes place, the solar activity acts
like to the instability factor. Balance of the solar activity effects
and the varying gravitational field effect alter in time depending on
location in the solar activity cycle.
Title: Uncontrolled Attitude Motion of the Foton-12 Satellite and
Quasi-Steady Microaccelerations onboard It
Authors: Abrashkin, V. I.; Balakin, V. L.; Belokonov, I. V.; Voronov,
K. E.; Zaitsev, A. S.; Ivanov, V. V.; Kazakova, A. E.; Sazonov, V. V.;
Semkin, N. D.
Bibcode: 2003CosRe..41...39A
Altcode:
The results of determination of the uncontrolled attitude motion of the
Foton-12 satellite (placed in orbit on September 9, 1999, terminated
its flight on September 24, 1999) are presented. The determination was
carried out by the onboard measurement data of the Earth's magnetic
field strength vector. Intervals with a duration of several hours
were selected from data covering almost the entire flight. On each
such interval the data were processed simultaneously using the least
squares method by integrating the satellite's equations of motion with
respect to the center of mass. The initial conditions of motion and
the parameters of the mathematical model employed were estimated in
processing. The results obtained provided for a complete representation
of the satellite's motion during the flight. This motion, beginning
with a small angular velocity, gradually sped up. The growth of the
component of the angular velocity with respect to the longitudinal axis
of the satellite was particularly strong. During the first several days
of the flight this component increased virtually after every passage
through the orbit's perigee. As the satellite's angular velocity
increased, its motion became more and more similar to the regular
Euler precession of an axisymmetric rigid body. In the last several
days of flight the satellite's angular velocity with respect to its
longitudinal axis was about 1 deg/s and the projection of the angular
velocity onto the plane perpendicular to this axis had a magnitude
of approximately 0.15 deg/s. The deviation of the longitudinal axis
from the normal to the orbit plane did not exceed 60°. The knowledge
of the attitude motion of the satellite allowed us to determine the
quasi-steady microacceleration component onboard it at the locations
of the technological and scientific equipment.
Title: Water mass distribution in Fram Strait and over the Yermak
Plateau in summer 1997
Authors: Rudels, B.; Meyer, R.; Fahrbach, E.; Ivanov, V. V.; Østerhus,
S.; Quadfasel, D.; Schauer, U.; Tverberg, V.; Woodgate, R. A.
Bibcode: 2000AnGeo..18..687R
Altcode:
The water mass distribution in northern Fram Strait and over the
Yermak Plateau in summer 1997 is described using CTD data from two
cruises in the area. The West Spitsbergen Current was found to split,
one part recirculated towards the west, while the other part, on
entering the Arctic Ocean separated into two branches. The main inflow
of Atlantic Water followed the Svalbard continental slope eastward,
while a second, narrower, branch stayed west and north of the Yermak
Plateau. The water column above the southeastern flank of the Yermak
Plateau was distinctly colder and less saline than the two inflow
branches. Immediately west of the outer inflow branch comparatively
high temperatures in the Atlantic Layer suggested that a part of the
extraordinarily warm Atlantic Water, observed in the boundary current
in the Eurasian Basin in the early 1990s, was now returning, within
the Eurasian Basin, toward Fram Strait. The upper layer west of the
Yermak Plateau was cold, deep and comparably saline, similar to what
has recently been observed in the interior Eurasian Basin. Closer
to the Greenland continental slope the salinity of the upper layer
became much lower, and the temperature maximum of the Atlantic Layer
was occasionally below 0.5 °C, indicating water masses mainly derived
from the Canadian Basin. This implies that the warm pulse of Atlantic
Water had not yet made a complete circuit around the Arctic Ocean. The
Atlantic Water of the West Spitsbergen Current recirculating within
the strait did not extend as far towards Greenland as in the 1980s,
leaving a broader passage for waters from the Atlantic and intermediate
layers, exiting the Arctic Ocean. A possible interpretation is that
the circulation pattern alternates between a strong recirculation
of the West Spitsbergen Current in the strait, and a larger exchange
of Atlantic Water between the Nordic Seas and the inner parts of the
Arctic Ocean.
Title: Albedo shifting: source functions in plane atmospheres.
Authors: Ivanov, V. V.; Kasaurov, A. M.
Bibcode: 1999Afz....42..485I
Altcode:
The standard problem of the radiative transfer theory is considered,
i.e., the evaluation of the radiation field in a plane-parallel
scattering atmosphere. Recently developed new approach to the
problem, the so-called albedo shifting technique, is used for the
evaluation of the source function for both semi-infinite and finite
atmospheres illuminated by parallel rays. The method enables one to
"dump" scattering and thus obtain solutions by only a few direct
Lambda-iterations even in those cases when the mean number of photon
scatterings in the atmosphere is large.
Title: Albedo-shifting method: Source function in a plane atmosphere
Authors: Ivanov, V. V.; Kasaurov, A. M.
Bibcode: 1999Ap.....42..363I
Altcode:
A classical problem in the theory of radiative transfer is
considered: calculating the radiation field within a plane scattering
atmosphere. The recently proposed albedo-shifting method is used
to calculate the source function both in a semi-infinite atmosphere
and in an atmophere of finite optical depth, illuminated by parallel
rays. The method enables one to “suppress” scattering and obtain
iterative solutions of the integral equation for the source function
in only a few direct lambda iterations, even when the average number
of photon scatterings in the atmosphere is very large.
Title: Albedo-shift method in the problem of anisotropic light
scattering in a plane atmosphere.
Authors: Ivanov, V. V.; Kasaurov, A. M.
Bibcode: 1998Ap.....41..408I
Altcode: 1999Ap.....41..408I
A standard problem of radiative transfer theory — calculating the
diffuse reflection and transmission of radiation by a plane scattering
atmosphere — is considered. The recently proposed albedoshift method
is used to calculate the X and Y functions (and the H function) for the
case of anisotropic scattering with a Henyey-Greenstein indicatrix. The
method enables one to “suppress” scattering and obtain iterative
solutions of high accuracy in only a few iterations, even when the
mean number of photon scatterings in the atmosphere is very large.
Title: Infrared spectroradiometric system ISTOK-1 of the MIR orbital
station
Authors: Dementiev, B. V.; Ivanov, V. V.; Kukin, S. G.; Ivanov,
Yu. S.; Silyakov, A. Y.; Chikin, A. D.; Shilin, N. V.; Maly, M.;
Jirka, V.; Orleansky, P.; Michalska, M.; Maris, O.; Shtefanov, L.;
Sargsyan, R. A.; Babayan, S. H.; Panchenko, V. A.
Bibcode: 1998SPIE.3406..119D
Altcode:
This paper presents a first-order performance analysis of the
Multichannel Infrared Spectroradiometer (MIRS) and the Visible-Infrared
TV-monitor and Atmospheric Refractometer (VISIR) as the integral parts
of the ISTOK-1 set of instruments that are working on the scientific
module 'Priroda' of the 'Mir' orbital station. The diffraction
polychromator MIRS measures thermal emission and absorption spectra
of the atmosphere in the wavelengths region 4 - 16 micrometer with the
spectral resolution of 0.15 - 0.3 micrometer. The CID TV-camera VISIR
measures the atmospheric refraction angles by observation of the Sun
rises and sets at wavelengths 1004 - 1024 nm with the accuracy of 20
arc. sec. The optical instruments are mounted upon a two-axle rotary
platform which can be controlled directly by the navigation system
of the station. The objectives of the ISTOK-1 experiments are the
development of the methods of ecological monitoring and meteorological
sounding of the Earth: tests of the new types of satellite-borned
monitors, measurement geometry, simultaneous using of spectrometry
and refractometry of the atmosphere. The ISTOK-1 system on the whole,
its optical instruments and their pre-flight tests are discussed.
Title: Albedo shifting: A new method in radiative transfer theory
Authors: Ivanov, V. V.
Bibcode: 1998ARep...42...89I
Altcode:
A new semianalytical method for calculating radiation fields in
monochromatically scattering semi-infinite atmospheres is described -
the albedo shifting method. In addition to the usual radiative transfer
equation in integral and differential form, an auxiliary equation
with the same general structure can be derived and used to reconstruct
the complete radiation field. By varying a parameter in the auxiliary
equation, the effective single-scattering albedo for this equation can
be arbitrarily changed. This makes it possible to make the contribution
of `scatterings' to the solution of the auxiliary equation small,
so that an iterative solution can be found efficiently. The source
function and radiation intensity are then calculated from the solution
of the auxiliary equation using simple formulas. In contrast to earlier
versions of the method, it is not assumed that the kernel of the main
(Wiener-Hopf-type) integral equation of the problem is a superposition
of exponentials. Numerical tests for the case of isotropic scattering
demonstrate the high efficiency of the method.
Title: Causality & Nonlocality in Problem of Radiative Damping
of Electron
Authors: Efremov, G. F.; Novikov, M. A.; Ivanov, V. V.; Efremov, A. G.
Bibcode: 1998clmp.conf...87E
Altcode:
No abstract at ADS
Title: Polarized line formation by resonance
scattering. II. Conservative case.
Authors: Ivanov, V. V.; Grachev, S. I.; Loskutov, V. M.
Bibcode: 1997A&A...321..968I
Altcode:
We consider multiple resonance scattering with complete frequency
redistribution (CFR) in a semi-infinite conservative atmosphere (photon
destruction probability ɛ_I_=0) with the sources at infinite depth. The
polarization arising in resonance scattering is completely accounted
for. The problem we consider is the resonance-scattering counterpart
of the Chandrasekhar-Sobolev problem of Rayleigh scattering in the
conservative atmosphere. The numerical data on the matrix source
function S(τ) in the atmosphere with conservative dipole resonance
scattering (the depolarization parameter W=1) are presented; we
assume Doppler profile. The source matrix is found by a non-iterative
numerical solution of the matrix Wiener-Hopf integral equation with
the matrix {LAMBDA}-operator. Depth dependence of the elements of the
source matrix S(τ) is discussed. Some unexpected peculiarities are
revealed in the behavior of its polarization terms. The matrix I(z)
which is the generalization of the Chandrasekhar H-function to the case
of polarized resonance scattering is found by the iterative solution of
the Chandrasekhar-type nonlinear matrix integral equation. We present
high-accuracy (5 s.f.) numerical data on I(z) for dipole conservative
scattering with the Doppler profile. The center-to-limb variation of the
degree of polarization in the core of a Doppler broadened resonance line
is found. In conservative case, the limiting limb polarization δ_0_
in the core of such a line is 9.4430% (for W=1). The dependence of
δ_0_ on the depolarization parameter W is found. Simple interpolation
formula, δ_0_=(9.443-38.05sqrt(ɛ)_I_)%, is suggested for the limb
polarization of the radiation emerging from an isothermal nearly
conservative atmosphere (ɛ_I_<<1, W=1). The data on I(z) are used
to find the polarization line profiles and to trace their center-to-limb
variation. The asymptotic expansions of S(τ) for τ-{infinity} (deep
layers) and of I(z) for z-{infinity} (line wings) are found for the
case of the Doppler profile. The coefficients of the expansions are
determined by recursion relations. The numerical data on the accuracy
and the domain of applicability of the asymptotic theory are presented.
Title: Polarized line formation by resonance scattering. I. Basic
formalism.
Authors: Ivanov, V. V.; Grachev, S. I.; Loskutov, V. M.
Bibcode: 1997A&A...318..315I
Altcode:
The model two-level problem of non-LTE line formation in homogeneous
plane atmospheres is reconsidered with the complete account of
polarization arising in resonance scattering. We use the approximation
of complete frequency redistribution (CFR) and restrict our discussion
to the most important case of axially symmetric radiation fields
in semi-infinite atmospheres. The primary sources are assumed to
be partially polarized. The problem is reduced to the 2x2 matrix
Wiener-Hopf integral equation for the matrix source function
S(τ). The matrix kernel K_1_(τ) of the {LAMBDA}-operator appearing
in this equation is represented as a continuous superposition of
exponentials. As we show in Paper II of the series, this enables one
to develop a matrix version of the analytical theory which, on the one
hand, is a generalization of the scalar CFR theory and, on the other,
is the CFR version of the theory of multiple monochromatic Rayleigh
scattering. As a preparatory step for this, we discuss in detail the
properties of the kernel matrix K_1_(τ) and the dispersion matrix
T(z). The latter is essentially the two-sided Laplace transform of
K_1_(τ). We consider the asymptotic behavior of K_1_(τ) and T(z)
for large τ and z, respectively. For the particular case of the
Doppler profile the complete asymptotic expansions of these matrices
are presented. These results are at the base of the theory presented
in Paper II of the series.
Title: Generalized Rayleigh scattering. IV. Emergent radiation.
Authors: Ivanov, V. V.; Kasaurov, A. M.; Loskutov, V. M.
Bibcode: 1996A&A...307..332I
Altcode:
In standard problems of multiple Rayleigh and molecular scattering,
the azimuth-independent component of the Stokes vector of the
radiation emerging from homogeneous semi-infinite atmospheres can
be expressed in terms of the 2x2 matrix I(μ). This matrix is a
generalization of the scalar H-function to the matrix case proposed as
an alternative to the commonly used H-matrix. Numerical data on I(μ)
for μ{in}[0,{infinity}) are presented and discussed. They are found
by iterative solution of the matrix equivalent of the alternative form
of the non-linear H-equation. For conservative Rayleigh scattering, the
matrix I(μ) is explicitly expressed in terms of Chandrasekhar's scalar
H-functions H_l_(μ) and H_r_(μ). The numerical results show that for
an atmosphere with uniformly distributed primary sources of partially
polarized radiation, the matrix Eddington - Barbier relation holds:
I(μ)=~S(τ=μ), where S(τ) is the matrix source function corresponding
to this problem. In the preceding papers of the present series it was
established that the matrix counterpart of the scalar conservative
scatering is `biconservative' scattering. By this we mean scattering
with λ_I_=λ_Q_=1, where λ_I_ is the usual albedo of single scattering
and λ_Q_=0.7Wλ_I_; here W is the depolarization parameter. We show
that, in case of biconservative scattering, the matrix version of
the Eddington approximation can be formulated. For an atmosphere with
uniformly distributed primary sources of unpolarized radiation, the
dependence of the limb polarization on the parameters λ_I_ and λ_Q_
is investigated. The data on I-matrices are used also to discuss the
center-to-limb variation of the degree of polarization δ(μ) of the
radiation emerging from such an atmosphere. The notion of the λ-plane,
i.e., the plane with the axes (λ_ I_,λ_I_), which was introduced in
the first paper of the series, is used to elucidate the non-trivial
dependence of the shape of the curve δ(μ) on λ_I_ and W.
Title: Generalized Rayleigh scattering. III. Theory of I-matrices.
Authors: Ivanov, V. V.
Bibcode: 1996A&A...307..319I
Altcode:
The paper continues investigation of azimuth-averaged radiation
fields in semi-infinite atmospheres with uniformly embedded sources
of partially polarized radiation. It is assumed that the single
scattering phase matrix is a superposition of the phase matrices of
Rayleigh and isotropic scattering appearing with weights W and 1-W,
respectively. Single scatttering is described by two parameters,
the albedo λ_I_ and the depolarization parameter W. An analytical
investigation is given of the properties of the Stokes matrix of the
emergent radiation I(μ) which is essentially the Laplace transform
of the source matrix S(τ). We show that I(μ) may be considered as
a matrix generalization of the usual scalar H-function. The commonly
used H-matrix is closely related, but not identical to I(μ). We argue
that I(μ) has some advantages as compared with H(μ). Using linear and
non-linear equations satisfied by I(μ), we find its asymptotic behavior
for μ-{infinity}. This enabled us to get explicit expressions for S(τ)
deep in the atmosphere. We show that the exact matrix equivalent of
scalar conservative scattering is not the usual conservative Rayleigh
scattering, but the biconservative scattering, i.e., scattering with
λ_I_=1,λ_Q_=0.7Wλ_I_=1. Although it corresponds to W=10/7>1 and
hence is `unphysical', biconservative scattering is, mathematically,
an important limiting case with remarkable properties. The asymptotic
theory of nearly biconservative scattering is developed. The matrices
I(μ) and S(τ) which depend on two small parameters, 1-λ_I_ and
1-λ_Q_, are asymptotically expressed in terms of the corresponding
parameter-free biconservative matrices. The final formulae are similar
to well-known scalar expressions. The paradoxical conclusion is reached
that the reason of qualitative differences in the overall structure of
fields of polarized and unpolarized radiation in strongly scattering
atmospheres is the weakness of cross-talk of the Stokes parameters I
and Q.
Title: Generalized Rayleigh scattering. I. Basic theory.
Authors: Ivanov, V. V.
Bibcode: 1995A&A...303..609I
Altcode:
The classsical problem of multiple molecular (in particular, Rayleigh)
scattering in plane-parallel atmospheres is considered from a somewhat
broader viewpoint than usual. The general approach and ideology are
borrowed from non-LTE line formation theory. The main emphasis is on
the depth dependence of the corresponding source matrix rather than on
the emergent radiation. We study the azimuth-averaged radiation field of
polarized radiation in a semi-infinite atmosphere with embedded primary
sources. The corresponding 2x2 phase matrix of molecular scattering
is P=(1-W) P_I_+W P_R_, where P_I_ and P_R_ are the phase matrices
of the scalar isotropic scattering and of the Rayleigh scattering,
respectively, and W is the depolarization parameter. Contrary to the
usual assumption that W{in}[0,1], we assume W{in} [0,{infinity}) and
call this generalized Rayleigh scattering (GRS). Using the factorization
of P which is intimately related to its diadic expansion, we reduce
the problem to an integral equation for the source matrix S(τ)
with a matrix displacement kernel. In operator form this equation is
S={LAMBDA}S+S^*^, where {LAMBDA} is the matrix {LAMBDA}-operator and
S^*^ is the primary source term. This leads to a new concept, the matrix
albedo of single scattering λ =diag(λ_I_,λ_Q_), where λ_I_ is the
usual (scalar) single scattering albedo and λ_Q_=0.7Wλ_I_. Its use
enables one to formulate matrix equivalents of many of the results of
the scalar theory in exactly the same form as in the scalar case. Of
crucial importance is the matrix equivalent of the sqrt(ɛ) law of
the scalar theory. Another useful new concept is the λ-plane, i.e.,
the plane with the axes (λ_I_,λ_Q_). Systematic use of the matrix
sqrt(ɛ) law and of the λ-plane proved to be a useful instrument
in classifying various limiting and particular cases of GRS and in
discussing numerical data on the matrix source functions (to be given
in Paper II of the series).
Title: Generalized Rayleigh scattering. II. Matrix source functions.
Authors: Ivanov, V. V.; Kasaurov, A. M.; Loskutov, V. M.; Viik, T.
Bibcode: 1995A&A...303..621I
Altcode:
Numerical and analytical data are presented on the matrix source
functions S(τ) of the standard problem of multiple generalized
Rayleigh scattering (GRS) in homogeneous semi-infinite atmospheres
with uniformly distributed embedded primary sources of partially
polarized radiation. The source matrices S(τ) are found by the
discrete-ordinate solution of the relevant 2x2 matrix transfer
equation and by albedo shifting technique, which is a version of the
accelerated {LAMBDA}-iteration approach. The dependence of the solution
of the matrix transfer equation on the parameters of the problem of
multiple molecular scattering, albedo of single scattering λ_I_
and depolarization factor W, is carefully considered. (The value
W=1 corresponds to Rayleigh scattering, while for scalar isotropic
scattering W=0). From the pair of the parameters (λ_I_, W) we switch
to (λ_I_, λ_Q_), with λ_Q_=0.7Wλ_I_, and instead of the physically
natural domain of the parameter values, λ_Iin[0,1], λ_
Qin[0,0.7λ_I_], in GRS we consider a wider one, λ_ I_,
λ_Qin[0,1]. On the plane with the axes (λ_I_, λ_Q_), or
the λ-plane, there is a one-parameter family of curves, the isopols,
along which S(0) remains constant. The λ-plane and the isopols
are the basic instruments in our analysis. Along with presenting
the numerical data we discuss the asymptotic behavior of S(τ) for
τ->{infinity}. It is shown that the matrix counterpart of the
usual scalar conservative isotropic scattering is not the ordinary
conservative Rayleigh scattering (λ_I_=1, λ_ Q_=0.7), but the
biconservative scattering, i.e., scattering with λ_I_=λ_Q_=1. The
analysis of the remarkable properties of biconservative scattering
naturally leads to matrix generalizations of the Hopf-Bronstein
relation, the Hopf constant etc.
Title: Resolvent method: exact solutions of half-space transport
problems by elementary means
Authors: Ivanov, V. V.
Bibcode: 1994A&A...286..328I
Altcode:
A new version of the resolvent method for solving half-space transport
problems is presented. We solve the integral transfer equation
with the {LAMBDA}-operator. The approach is based on the use of a
non-linear equation relating the surface Green function G_0_(τ) for the
semi-infinite medium and the Green function Ginfinity_(τ)
for the infinite medium. This Ginfinity_(τ) is assumed
known. The equation is first used to derive, literally in one line,
the famous sqrt(ɛ) law. Then, by a short series of elementary
transformations, we obtain the Fock-Chandrasekhar explicit
expression for the H-function. Assuming that the kernel function
of the {LAMBDA}-operator is a Laplace-type integral, we derive the
usual explicit expression for G_0_(τ) in the form of a similar
integral. The integrand involves only the functions appearing
in the explicit expression for G_0_(τ), and the H-function. And
again, the derivation is elementary, i.e., without any use of the
complex plane, and surprisingly short; the non-linear H-equation
is completely by-passed. Alternative equations satisfied by the
H-function are presented, among them a linear integral equation with
a non-singular kernel. The standard non-linear H-equation is used to
find the asymptotic behavior of the solution of the homogeneous transfer
equation in deep layers of the semi-infinite atmosphere. In conclusion,
a brief comment on the development of the resolvent method is given.
Title: Investigation of the structure of Ps 6 geomagnetic pulsations
by spectral methods
Authors: Ivanov, V. V.; Rotanova, N. M.
Bibcode: 1991Ge&Ae..31..625I
Altcode:
An algorithm using the maximum entropy method and the harmonic
approximation model with constant coefficients is developed which
makes it possible to investigate the frequency and amplitude-phase
characteristics of Ps 6 pulsations. It is shown that the generation
of these pulsations is a complex process, in which both the pulsed
and quasi-periodic components play important roles.
Title: Analytical Methods of Line Formation Theory - are they
Still Alive
Authors: Ivanov, V. V.
Bibcode: 1991ASIC..341...81I
Altcode: 1991sabc.conf...81I
No abstract at ADS
Title: Nonmagnetic polarization of the Doppler cores of Fraunhofer
resonance lines
Authors: Ivanov, V. V.
Bibcode: 1990AZh....67.1233I
Altcode:
Peaks of linear polarization observed near the solar limb in Doppler
cores of resonant Fraunhofer lines are investigated. The polarization is
due to resonant scattering. It is shown that the well-known result of
the scalar theory of line formation, i.e., the so-called sq rt of 1 -
lambda law (where lambda is the probability of photon survival during
scattering), can be generalized to include polarization. In addition,
a vector generalization of Rybicki's quadratic integral of the radiative
transfer equation is presented.
Title: Nonmagnetic Polarization of the Doppler Cores of Fraunhofer
Resonance Lines
Authors: Ivanov, V. V.
Bibcode: 1990SvA....34..621I
Altcode:
No abstract at ADS
Title: Pinch-mechanism of energy release of stellar flares.
Authors: Ajrapetyan, V. S.; Vikhrev, V. V.; Ivanov, V. V.; Rozanova,
G. A.
Bibcode: 1990Afz....32..405A
Altcode: 1990Afz....32..405H
A model of stellar flares which is based on the pinch-mechanism of
floating magnetic field energy transformation into kinetic and thermal
energy of plasma of a stellar atmosphere is presented. Numerical
modelling of a closed magnetic configuration in the framework of
MHD-approximation was performed. The possibility of magnetic energy
transformation without reconnection mechanism on this stage is shown.
Title: Pinch Mechanism of Energy Release of Stellar Flares
Authors: Airapetyan, V. S.; Vikhrev, V. V.; Ivanov, V. V.; Rozanova,
G. A.
Bibcode: 1990Ap.....32..230A
Altcode:
No abstract at ADS
Title: Structure of the spectrum of Ps6 pulsations
Authors: Zaitsev, A. N.; Ivanov, V. V.
Bibcode: 1990Ge&Ae..30..315Z
Altcode:
Six cases of long-period Ps6 pulsations were analyzed on the basis of
digital magnetic-variation data with a 1-minute resolution. It is shown
that in all cases the spectra have several peaks where it is possible
to isolate a main peak with periods of 18-30 min and harmonics of 12-16
and 8-10 min. The values of the periods vary from case to case but their
relation as fundamental and harmonic components remains invariable.
Title: Invariance principles used for reduction of the transfer
equation to new forms.
Authors: Ivanov, V. V.
Bibcode: 1989fapi.conf...82I
Altcode:
The principle of invariance is used to show that the transfer
equation for half-space illuminated from outside may be reduced to
a form in which then intensity in downward directions (μ > 0)
can be found without knowledge of the intensity for μ < 0. The
result holds for an arbitrary phase function. The case of isotropic
scattering is used as a working example. It is also shown that the
problem of nonconservative scattering in half-space may be reduced to
a conservative "pseudoproblem". The source function corresponding to
this conservative pseudoproblem is the solution of an integral equation
of the Wiener-Hopf type.
Title: Overabundance of Sodium in the Atmospheres of Massive
Supergiants as a Possible Manifestation of Nena Cycle
Authors: Boyarchuk, A. A.; Denisenkov, P. A.; Hubeny, I.; Ivanov,
V. V.; Kubat, I.; Lyubimkov, L. S.; Sakhibullin, N. A.
Bibcode: 1988LNP...305...94B
Altcode: 1988IAUCo.108...94B; 1988adse.conf...94B
No abstract at ADS
Title: Sodium synthesis during hydrogen burning in stars
Authors: Denisenkov, P. A.; Ivanov, V. V.
Bibcode: 1987PAZh...13..520D
Altcode:
It is shown that, in hydrogen-burning main-sequence stars with a
mass exceeding 1.5 solar masses, the Ne-22 (p, gamma) Na-23 reaction
must lead to a substantial (more than five-fold) sodium enrichment of
their cores. A correlation is found between the C-12/C-13 ratio and
the overabundance of Na in the atmospheres of F-K supergiants with a
lowered abundance of C.
Title: Sodium Synthesis in Hydrogen Burning Stars
Authors: Denisenkov, P. A.; Ivanov, V. V.
Bibcode: 1987SvAL...13..214D
Altcode:
No abstract at ADS
Title: Astronomers. Biographical Handbook.
Authors: Kolchinskij, I. G.; Korsun', A. A.; Rodriges, M. G.; Ivanov,
V. V.
Bibcode: 1986abh..book.....K
Altcode:
No abstract at ADS
Title: The transfer of line radiation. IV - A long-standing puzzle
Authors: Ivanov, V. V.
Bibcode: 1985SvA....29..162I
Altcode:
It is shown that the square-root laws that occur in many problems of
multiple-scattering theory and that have long seemed puzzling admit
of a straightforward probabilistic interpretation. It is demonstrated
that the square root of the direct photon-escape probability that
occurs in various problems of line-radiation transfer comes about
through a combination of half-space geometry and the longest-flight
approximation (LFA). In effect this represents the half-space version
of the Rybicki-Hummer (1982) LFA.
Title: On a Long-Standing Problem of the Radiative Transfer Theory
Authors: Ivanov, V. V.
Bibcode: 1985AZh....62..283I
Altcode:
The standard problem of the theory of line formation (i.e., isothermal
semi-infinite atmosphere, two-level atom, complete frequency
redistribution upon scattering, no continuum absorption) is considered.
Title: The transfer of line radiation. II - Approximate solutions
for semi-infinite atmospheres
Authors: Ivanov, V. V.; Serbin, V. M.
Bibcode: 1984AZh....61..900I
Altcode:
The transfer of line radiation in a two-level atom is investigated
theoretically, continuing the analysis of Ivanov and Serbin (1984) and
evaluating the second-order semiinfinite-atmosphere escape-probability
approximations of Ivanov (1971) and Frisch and Frisch (1975),
designated L2 and F, respectively, in detail. Topics considered
include the basic equations, the filtration of spatial frequencies for
multiple scattering, fundamental and standard problems, numerically
exact solutions by kernel approximation, the accuracy of L2 and F,
and exponential sources. Over the entire range of values of the Voigt
parameter a, the error of L2 is shown to remain below 40 percent, while
order-of-magnitude errors occur when F is applied at high values of tau.
Title: The Transfer of Line Radiation - Part Two - Approximate
Solutions for Semi-Infinite Atmospheres
Authors: Ivanov, V. V.; Serbin, V. M.
Bibcode: 1984SvA....28..524I
Altcode:
No abstract at ADS
Title: The transfer of line radiation. I. General analysis of
approximate solutions
Authors: Ivanov, V. V.; Serbin, V. M.
Bibcode: 1984AZh....61..691I
Altcode:
A critical analysis is given of various approximate solutions of the
line transfer equation for static plane atmospheres under the assumption
of complete frequency redistribution.
Title: The transfer of line radiation. I - General analysis of
approximate solutions
Authors: Ivanov, V. V.; Serbin, V. M.
Bibcode: 1984SvA....28..405I
Altcode:
A critical analysis is given of several approximate solutions to the
equation of line-radiation transfer in a plane, static atmosphere,
assuming complete frequency redistribution. The relationship between the
first- and second-order escape probability (L1, L2) approximations is
explained. The F approximation of U. and H. Frisch and the C squared
approximation of Puetter et al. (1982) are discussed as well. Using
Rybicki's (1977) quadratic Q-integral it is shown that L1 is intimately
related to F and C squared. The assumption underlying F, C squared
is brought out explicitly for the first time. If the primary source
function S-asterisk(pi) is indeed depth-dependent, then F, C squared,
unlike L2, may introduce enormous error.
Title: The First Steps in the Calculations of a Stellar Structure
at the Astronomical Observatory of the Leningrad University
Authors: Artemiev, K. N.; Denisenkov, P. A.; Ivanov, V. V.; Ilyin,
V. B.
Bibcode: 1984CoBAO..55...20A
Altcode: 1984SoByu..55...20A
Extensive calculations of the simplest stellar models have been carried
out at the Astronomical Observatory of the Leningrad University. The
models considered in the study include classical polytropes,
homologous models, Chandrasekhar and Hamada-Salpeter white dwarf
models, chemically homogeneous ZAMS stars. The structure of the models
is considered in detail. The intercomparisons of the models are also
given. The dependence of the global parameters of ZAMS stars and white
dwarfs, namely, radius, luminosity, gravitational binding energy, the
moment of inertia, etc., on the mass of the model is discussed. Simple
approximations of the corresponding relations are found. The results
are being published in "Trudi Astron. Obs. Leningrad Univ.", vol. 40.
Title: Proceedings of the colloquium of the Department of Astrophysics
of the Leningrad State University, of the Astronomical Council of the
USSR Academy of Sciences and the Byurakan Astrophysical Observatory
of the Academy of Sciences of the Armenian SSR, held on 14 - 16
October 1983.
Authors: Mirzoyan, L. V.; Ivanov, V. V.; Masevich, A. G.; Tovmasyan,
G. M.
Bibcode: 1984pcda.book.....M
Altcode:
No abstract at ADS
Title: The probabilistic significance of the square root laws in
radiation transfer theory
Authors: Ivanov, V. V.
Bibcode: 1984CoBAO..55...19I
Altcode: 1984SoByu..55...19I
In the theory of transfer of line radiation, there is a well-known
approximation of the line source function in terms of the square root of
the probability of direct escape of a photon. Thus, in the homogeneous
semi-infinite isothermal atmosphere, the source function divided by the
Planck function is perfectly approximated by the expression of the form
S(tau) = (1-lambda)1/2[1-lambda+lambdaK2(tau)]-1/2, where (1-lambda) is
the probability of photon destruction per scattering and (1/2)K2(tau)
is the probability of direct escape of a photon from depth tau across
the boundary tau = 0. The physical significance of this approximation,
which has been recently widely used and generalized in several
directions, is still "completely mysterious", in the words of Hummer
and Rybicki. In the author's paper now in press in Astronomicheskij
Zhurnal, this approximation is prone to have a simple probabilistic
(and physical) significance. It is essentially a half space. a version
of the well-known longest-flight approximation of Rybicki and Hummer
(Monthly Notices Roy. Astron. Soc., 144, 313, 1969). This approximation
has a wide range of applicability. In a sense, it is the opposite of
the usual diffusion approximation.
Title: Line-radiation transfer - Comparative approximations
Authors: Ivanov, V. V.
Bibcode: 1983PAZh....9..364I
Altcode:
Some highly accurate approximate solutions to the radiative transfer
problem for spectral lines, which before long may radically change the
way that line-radiation fields are calculated in non-LTE atmospheres,
are compared against the exact asymptotic solutions given by analytic
methods. Standard line-formation theory serves as a working example.
Title: Line Radiation Transfer - Comparative Approximations
Authors: Ivanov, V. V.
Bibcode: 1983SvAL....9..192I
Altcode:
No abstract at ADS
Title: Notes on polytropes.
Authors: Ivanov, V. V.; Ilin, V. B.
Bibcode: 1983TrLen..38....7I
Altcode:
The dimensionless central pressure pc =
4πR4Pc/GM2, gravitational
binding energy ω = -ΩR/GM2 and moment of inertia i =
I/MR2 of an arbitrary spherical configuration in hydrostatic
equilibrium are shown to satisfy the inequalities pc ≥
8 ω4, i ≥ 2/(125 ω2). The dependence of
global characteristics of polytropes such as pc, i, central
temperature tc = TcRR/μGM etc. on polytropic
index n is studied.
Title: 100th anniversary of the Astronomical Observatory of the
Leningrad University.
Authors: Ivanov, V. V.
Bibcode: 1983ZemVs...2...59I
Altcode:
No abstract at ADS
Title: Balloon spectrometer for atmospheric investigations in the
infrared range.
Authors: Beshmenev, A. S.; Dement'ev, B. V.; Ivanov, V. V.; Kukin,
S. G.; Markov, M. N.
Bibcode: 1983nkp.....2...86B
Altcode:
No abstract at ADS
Title: Aerostat Fourier-spectrometer for astronomical investigations
in the 50-140 μm region.
Authors: Beshmenev, A. S.; Ivanov, V. V.; Kartashev, A. V.; Markov,
M. N.
Bibcode: 1982TrSSR.130..141B
Altcode:
No abstract at ADS
Title: Astronomy at the ST.PETERSBURG / Leningrad University in
1881-1930
Authors: Ivanov, V. V.; Maksimova, T. M.
Bibcode: 1981TrLen..37....7I
Altcode:
No abstract at ADS
Title: Radiative transfer theory
Authors: Ivanov, V. V.
Bibcode: 1981TrLen..37...70I
Altcode:
The methods used in theoretical studies of radiative transfer are
reviewed. Previous investigations are discussed which were based on the
principle of invariance, the transfer of polarized radiation in moving
atmospheres, radiative transfer in spectral lines, or inhomogeneous
atmospheres. Consideration is also given to the cases of time-dependent
radiation fields and nongray atmospheres.
Title: A Fourier method for determining stellar rotational velocities
Authors: Ilin, V. B.; Ivanov, V. V.
Bibcode: 1979SvAL....5..152I
Altcode: 1979PAZh....5..285I
Power-spectrum analysis of a stellar spectrum is a natural way to
extract all the information on the rotation of the star that its
spectrum conveys. As an illustration, the method is implemented for
stars whose rotation is known.
Title: Book-Review - Stellar Atmospheres
Authors: Mihalas, D.; Ivanov, V. V.
Bibcode: 1979SvA....23..386M
Altcode:
No abstract at ADS
Title: Book Review: Stellar atmospheres
Authors: Ivanov, V. V.
Bibcode: 1979AZh....56..683I
Altcode:
No abstract at ADS
Title: Book Review: Stellar atmospheres
Authors: Ivanov, V. V.
Bibcode: 1979SvA....23..386I
Altcode:
No abstract at ADS
Title: Radiative Transfer - Principles of Invariance for the Green's
Functions
Authors: Ivanov, V. V.; Volkov, E. V.
Bibcode: 1979TrLen..35....3I
Altcode:
No abstract at ADS
Title: Nonlinear equations in linear problems of radiation transfer
in plane atmospheres
Authors: Ivanov, V. V.
Bibcode: 1978SvA....22..612I
Altcode:
No abstract at ADS
Title: Nonlinear equations in linear problems of radiation transfer
in plane atmospheres
Authors: Ivanov, V. V.
Bibcode: 1978AZh....55.1072I
Altcode:
Rybicki (1977) has established that, besides the generally known
integrals that are linear with respect to intensity (I), the equation
of radiative transfer also has certain integrals that are quadratic
with respect to I. This paper shows that, by starting from Rybicki's
basic idea, more general equations that are bilinear with respect to
I can be obtained. Attention is restricted to the simplest case of
isotropic scattering without a change in frequency. Generalizations
to anisotropic scattering and to scattering in line frequencies with
complete frequency redistribution are briefly discussed.
Title: Errata
Authors: Ivanov, V. V.
Bibcode: 1978Ap.....14..394I
Altcode:
No abstract at ADS
Title: Erratum: "Radiative transfer in finite
atmospheres. I." [Astrofizika, Tom 12, p. 255 - 271 (1976)].
Authors: Ivanov, V. V.
Bibcode: 1978Afz....14..694I
Altcode:
No abstract at ADS
Title: On the standard problem of the theory of radiative transfer.
Authors: Ivanov, V. V.
Bibcode: 1977Afz....13..505I
Altcode:
The standard problem of computing the radiation field in an
isotropically dispersing semiinfinite atmosphere with exponentially
distributed primary sources is considered on the basis of invariance
principles. It is shown that there are several representations for the
source function as a sum of the integral over the angular variable of
intensity, taken with a certain weight, and a pseudosource corresponding
to that weight. The representations include those which express the
source function in terms of the intensity in downward directions
alone. It is also found that the source function satisfies both the
standard integral equation with a specific kernel and another equation
with a symmetric difference kernel.
Title: Radiative transfer M. N. Ozisik
Authors: Ivanov, V. V.
Bibcode: 1977Ap.....13..308I
Altcode:
No abstract at ADS
Title: A standard problem of the theory of radiative transport
Authors: Ivanov, V. V.
Bibcode: 1977Ap.....13..284I
Altcode:
No abstract at ADS
Title: Radiation transfer in infinite atmospheres. II
Authors: Ivanov, V. V.
Bibcode: 1976Ap.....12..369I
Altcode:
No abstract at ADS
Title: Statistics of intensities in the solar spectrum
Authors: Ivanov, V. V.; Salman-Zade, R. Kh.
Bibcode: 1976SvA....20..468I
Altcode:
No abstract at ADS
Title: Statistics of intensities in the solar spectrum
Authors: Ivanov, V. V.; Salman-Zade, R. Kh.
Bibcode: 1976AZh....53..827I
Altcode:
The paper considers the intensity of the solar optical line spectrum
to be a random function of wavelength, assuming the function to
be stationary within a spectral region of about 100 A. Single point
distribution functions of this random function are examined, and it is
shown that the dispersion of fluctuations of spectral intensity in the
center of the solar disk decreases smoothly from the short to long wave
(from violet to red) regions of the spectrum. Intensity fluctuations
also strongly decrease from the center to the limb.
Title: Radiative equilibrium of highly nongray atmospheres. I. General
analysis
Authors: Ivanov, V. V.; Kheinlo, A. G.
Bibcode: 1976SvA....19..750I
Altcode:
Radiative equilibrium of an atmosphere in which the departures
from greyness are small-scale in frequency, although they may be
arbitrarily strong is considered. It is shown that one may use a
statistical approach to describe the small-scale dependence of the
intensity on frequency, retaining at the same time all the information
on large-scale variations of the intensity with frequency. This
description is based on the use of a new concept introduced in the
paper, namely, partial intensity of radiation. It is assumed that
the opacity probability distribution function does not vary along
the spectrum and is depth-independent. Under these assumptions
the temperature profile is shown to satisfy a homogeneous integral
equation with a symmetrical displacement kernel. This equation is a
generalization of the Milne equation.
Title: Radiation field in an optically thick planetary atmosphere
adjacent to a reflecting surface
Authors: Ivanov, V. V.
Bibcode: 1976SvA....20..332I
Altcode:
No abstract at ADS
Title: Radiation field in an optically thick planetary atmosphere
adjacent to a reflecting surface
Authors: Ivanov, V. V.
Bibcode: 1976AZh....53..589I
Altcode:
The radiation field in an externally illuminated optically thick
planetary atmosphere overlaying a surface which reflects radiation
according to an arbitrary law is studied. Asymptotic expressions are
found for the intensity of radiation diffusely reflected from the
atmosphere, incident on the surface of the planet, and propagating
within the atmosphere far from the boundaries.
Title: Selection of optimum spectral range for satellite probing of
atmospheric water vapor
Authors: Ivanov, V. V.; Markov, M. N.
Bibcode: 1976CosRe..13..744I
Altcode:
No abstract at ADS
Title: Radiative transfer in infinite atmospheres. I.
Authors: Ivanov, V. V.
Bibcode: 1976Afz....12..255I
Altcode:
The radiation field in an anisotropically scattering infinite
homogeneous atmosphere with a plane unidirectional radiation source is
considered. An integral equation is obtained for the angular dependence
of the intensity of diffuse radiation in the plane of the source, which
does not require knowledge of the radiation field at all depths. If
the scattering phase function is expanded in Legendre polynomials,
then separation of angular variables is possible. The case of isotropic
scattering is examined in detail.
Title: Frequency relaxation in multiple scattering of line radiation.
Authors: Ivanov, V. V.; Shnejvajs, A. B.; Schneeweiss, A. B.
Bibcode: 1976Afz....12..245I
Altcode:
No abstract at ADS
Title: Asymptotics of Green's function of the transfer equation for
polarized radiation
Authors: Domke, H.; Ivanov, V. V.
Bibcode: 1976SvA....19..624D
Altcode:
The problem of multiple scattering of polarized light in a
plane-parallel isotropic medium with an arbitrary single-scattering
law is considered by investigating the asymptotic properties of Green's
function in the vector equation of radiative transfer. Asymptotic forms
of Green's function are derived and analyzed for an infinite medium,
a semi-infinite medium, and a medium with little true absorption. It
is shown that the polarization of radiation emerging from a medium
after a large number of scatterings may not be small and that the
approximate method of calculating the polarization of emerging
radiation, which takes account of only the first few scatterings,
may lead to substantial errors.
Title: Frequency relaxation in multiple scattering of line radiation
Authors: Ivanov, V. V.; Shneivais, A. B.
Bibcode: 1976Ap.....12..152I
Altcode:
No abstract at ADS
Title: Radiative transfer in infinite atmospheres. I
Authors: Ivanov, V. V.
Bibcode: 1976Ap.....12..158I
Altcode:
No abstract at ADS
Title: Diffraction of acoustic-gravitational waves round the
spherical earth.
Authors: Ivanov, V. V.; Korzhenevich, I. M.
Bibcode: 1976Ge&Ae..16..815I
Altcode:
The influence of the thermal stratification of the atmosphere and the
sphericity of the earth surface on the propagation (at a near-sonic
velocity) of wavelike ionospheric disturbances is studied by analyzing
the respective wave equation. The regions in the actual atmosphere
are identified for which the approximations of a flat earth and an
isothermal atmosphere are justified.
Title: Radiative transfer in an infinite atmosphere. II.
Authors: Ivanov, V. V.
Bibcode: 1976Afz....12..565I
Altcode:
No abstract at ADS
Title: Radiative transfer in a multilayer optically thick
atmosphere. I.
Authors: Ivanov, V. V.
Bibcode: 1976TrLen..32....3I
Altcode:
An asymptotic analysis of the reflection and transmission
characteristics of anisotropically scattering plane-parallel atmospheres
consisting of several optically thick layers with different optical
properties is performed. First, an inhomogeneous medium consisting of
two contacting half-spaces with a source at infinity (Milne's problem
for contacting half-spaces) is considered. The angular dependence of
the intensity at the interface and the asymptotic behavior far from
it are studied. Asymptotically exact expressions for the reflection
and transmission coefficients of an atmosphere consisting of several
optically thick layers with different photon survival probabilities
and scattering indicatrices are given.
Title: Radiative transfer in a multilayer optically thick
atmosphere. II.
Authors: Ivanov, V. V.
Bibcode: 1976TrLen..32...23I
Altcode:
No abstract at ADS
Title: Radiative equilibrium of highly nongray atmospheres. I. General
analysis
Authors: Ivanov, V. V.; Kheinlo, A. G.
Bibcode: 1975AZh....52.1252I
Altcode:
Radiative equilibrium of an atmosphere in which the departures
from greyness are small-scale in frequency, although they may be
arbitrarily strong is considered. It is shown that one may use a
statistical approach to describe the small-scale dependence of the
intensity on frequency, retaining at the same time all the information
on large-scale variations of the intensity with frequency. This
description is based on the use of a new concept introduced in the
paper, namely, partial intensity of radiation. It is assumed that
the opacity probability distribution function does not vary along
the spectrum and is depth-independent. Under these assumptions
the temperature profile is shown to satisfy a homogeneous integral
equation with a symmetrical displacement kernel. This equation is a
generalization of the Milne equation.
Title: Selection of the optimum spectral region in the problem of
satellite soundings of atmospheric water vapor
Authors: Ivanov, V. V.; Markov, M. N.
Bibcode: 1975KosIs..13..834I
Altcode: 1976CosRe..13..834I; 1975CosRe..13..834I
The article deals with the optimum choice of spectral region, in
terms of information content and existing equipment, for acquiring
data on atmospheric water content. Constraints on available method
(range of heights, spectral intervals, sensitivity) are listed. The
model of the atmosphere employed, channels for sounding, moisture
profile calculations, and sounding equipment design and sensitivity
are discussed. The procedure put forth for selecting channels for
satellite soundings of water vapor content, theoretical analysis
of the transport equation for the earth's atmosphere, and numerical
calculations indicate the 20 to 50 micron spectral interval (water
rotational band) is the optimum one, and Fourier spectrometers and
Michelson interferometers are recommended as the preferred instruments.
Title: Invariance principles and internal radiation fields in
semiinfinite atmospheres
Authors: Ivanov, V. V.
Bibcode: 1975SvA....19..137I
Altcode:
No abstract at ADS
Title: Asymptotics of Green's function of the transfer equation for
polarized radiation
Authors: Domke, H.; Ivanov, V. V.
Bibcode: 1975AZh....52.1034D
Altcode:
The problem of multiple scattering of polarized light in a
plane-parallel isotropic medium with an arbitrary single-scattering
law is considered by investigating the asymptotic properties of Green's
function in the vector equation of radiative transfer. Asymptotic forms
of Green's function are derived and analyzed for an infinite medium,
a semi-infinite medium, and a medium with little true absorption. It
is shown that the polarization of radiation emerging from a medium
after a large number of scatterings may not be small and that the
approximate method of calculating the polarization of emerging
radiation, which takes account of only the first few scatterings,
may lead to substantial errors.
Title: Description of a Radio Signal Reflected from the Earth's
Surface
Authors: Ivanov, V. V.; Korzhenivich, I. M.
Bibcode: 1975Ge&Ae..14..641I
Altcode:
No abstract at ADS
Title: Invariance principles and internal radiation fields in
semiinfinite atmospheres
Authors: Ivanov, V. V.
Bibcode: 1975AZh....52..217I
Altcode:
No abstract at ADS
Title: Radiation spectrum of the earth at wavelengths of 13-60 microns
Authors: Ivanov, V. V.; Markov, M. N.
Bibcode: 1975CosRe..12..696I
Altcode:
No abstract at ADS
Title: Description of a radio signal reflected from the earth's
surface
Authors: Ivanov, V. V.; Korzhenevich, I. M.
Bibcode: 1974GeA....14..751I
Altcode:
No abstract at ADS
Title: Radiation Spectrum of the Earth at Wavelengths of 13-60 μ
Authors: Ivanov, V. V.; Markov, M. N.
Bibcode: 1974CosRe..12..696I
Altcode:
No abstract at ADS
Title: The spectrum of the earth's radiation in the region between
13 and 16 mµ.
Authors: Ivanov, V. V.; Markov, M. N.
Bibcode: 1974KosIs..12..767I
Altcode: 1974CosRe..12..767I; 1975CosRe..12..767I
Onboard Fourier spectrometry was used to obtain radiation spectra of
the earth in the 13-60 micron region at altitudes of 29-33 km for CO2
bands and H2O bands in winter and summer. The spectral resolution was
2.5-15/cm. The shapes of the spectra provide information on peculiar
altitude dependences of the atmospheric temperature (temperature
inversions) while the intensity suggests possibilities for determining
the altitude dependence of humidity from the radiation in the region
200-400/cm. The data agree with similar data obtained from radio probes.
Title: Asymptotic properties of radiation fields in semiinfinite
atmospheres
Authors: Ivanov, V. V.
Bibcode: 1974Ap.....10..117I
Altcode:
No abstract at ADS
Title: Asymptotic properties of radiation fields in semi-infinite
atmospheres.
Authors: Ivanov, V. V.
Bibcode: 1974Afz....10..193I
Altcode:
No abstract at ADS
Title: Phenomenological presentation of the path of propagation of
electromagnetic impulses in the ionosphere and solar corona.
Authors: Ivanov, V. V.; Chudnovskij, L. S.
Bibcode: 1974KosIs..12..109I
Altcode:
No abstract at ADS
Title: Phenomenological Representation of Propagation Path of
Electromagnetic Pulses through the Ionosphere and Solar Corona
Authors: Ivanov, V. V.; Chudnovskii, L. S.
Bibcode: 1974CosRe..12...97I
Altcode:
No abstract at ADS
Title: Multiple scattering of light in semi-infinite atmospheres
Authors: Ivanov, V. V.; Sabashvili, Sh. A.
Bibcode: 1973Ap......9..187I
Altcode:
No abstract at ADS
Title: Multiple light scattering in semi-infinite atmospheres.
Authors: Ivanov, V. V.; Sabashvili, Sh. A.
Bibcode: 1973Afz.....9..333I
Altcode:
No abstract at ADS
Title: On the asymptotic theory of multiple light scattering in
semi-infinte media.
Authors: Ivanov, V. V.; Sabashvili, Sh. A.
Bibcode: 1973SoGru..70..589I
Altcode:
No abstract at ADS
Title: Transfer of radiation in spectral lines
Authors: Ivanov, V. V.
Bibcode: 1973trsl.book.....I
Altcode:
No abstract at ADS
Title: Approximate Solution to the Equation of Radiative Transfer
in Line Frequencies.
Authors: Ivanov, V. V.
Bibcode: 1972SvA....16...91I
Altcode:
No abstract at ADS
Title: Transfer of Resonance Radiation and Photon Random Walks
Authors: Ivanov, V. V.; Sabashvili, Sh. A.
Bibcode: 1972Ap&SS..17...13I
Altcode:
Transfer of resonance radiation in an infinite medium is considered
as a process of random walks of photons. Close relation is shown
to exist between the problems of transfer of line radiation and the
stable distributions of the probability theory. This relation is used
as a basis of a new method for the investigation of the asymptotic
properties of the radiation field far from the sources.
Title: Forecasting the Characteristics of the Normal Ionospheric
E-Layer
Authors: Ivanov, V. V.; Stepanov, B. M.; Fil'Chenkov, M. L.
Bibcode: 1972Ge&Ae..11..834I
Altcode:
No abstract at ADS
Title: Approximate Solution to the Equation of Radiative Transfer
in Line Frequencies.
Authors: Ivanov, V. V.
Bibcode: 1972AZh....49..115I
Altcode:
No abstract at ADS
Title: Transfer of Resonance Radiation and Photon Random Walks
(In Russian)
Authors: Ivanov, V. V.; Sabashvili, Sh. A.
Bibcode: 1972Ap&SS..17....3I
Altcode:
Transfer of resonance radiation in infinite medium is considered as a
process of random walks of photons. Close relation is shown to exist
between the problems of transfer of line radiation and the stable
distributions of the probability theory. This relation is used as a
basis of a new method for the investigation of the asymptotic properties
of the radiation field far from the sources
Title: Propagation of Electromagnetic Signals along the
Earth-Ionosphere Wave Guide
Authors: Ivanov, V. V.; Stepanov, B. M.
Bibcode: 1971Ge&Ae..10..811I
Altcode:
No abstract at ADS
Title: The mean free path of a photon in a scattering medium
Authors: Ivanov, V. V.
Bibcode: 1970Ap......6..355I
Altcode:
No abstract at ADS
Title: Mean length of photon path in a scattering medium.
Authors: Ivanov, V. V.
Bibcode: 1970Afz.....6..643I
Altcode:
No abstract at ADS
Title: Transfer of resonance radiation in purely scattering media -
I. Semi-infinite medium.
Authors: Ivanov, V. V.
Bibcode: 1970JQSRT..10..665I
Altcode:
No abstract at ADS
Title: Transfer of resonance radiation in purely scattering media -
II.. Optically thick layer.
Authors: Ivanov, V. V.
Bibcode: 1970JQSRT..10..681I
Altcode:
No abstract at ADS
Title: Physics of stars, nebulae and galaxies (Symposium at Byurakan,
1968 Sept. 16 - 20).
Authors: Arakelyan, M. A.; Ivanov, V. V.; Tovmasyan, G. M.
Bibcode: 1969VeSSR...3..125A
Altcode:
No abstract at ADS
Title: Stars, nebulae, galaxies. Publications of the symposium held
on the occasion of the 60th birthday of V._A. Ambartsumyan, Byurakan,
16_-_18 September 1968.
Authors: Boyarchuk, A. A.; Ivanov, V. V.; Mirzoyan, L. V.; Sobolev,
V. V.; Tovmasyan, G. M.
Bibcode: 1969sngp.book.....B
Altcode:
No abstract at ADS
Title: Radiative transfer and spectra of celestial bodies.
Authors: Ivanov, V. V.
Bibcode: 1969rtsc.book.....I
Altcode:
No abstract at ADS
Title: Milne's problem in the theory of spectral line formation
Authors: Ivanov, V. V.
Bibcode: 1968Ap......4....1I
Altcode:
No abstract at ADS
Title: Time variation of the profile of a Doppler broadened resonance
line
Authors: Ivanov, V. V.
Bibcode: 1967BAN....19..192I
Altcode:
No abstract at ADS
Title: Transfer of resonance radiation in an infinite medium. II.
Authors: Ivanov, V. V.; Nagirner, D. I.
Bibcode: 1966Ap......2...75I
Altcode:
No abstract at ADS
Title: Transfer of resonance radiation in an infinite medium. I
Authors: Nagirner, D. I.; Ivanov, V. V.
Bibcode: 1966Ap......2....1N
Altcode:
No abstract at ADS
Title: Scattering of Light in an Atmosphere of Finite Optical
Thickness
Authors: Ivanov, V. V.
Bibcode: 1965SvA.....8..874I
Altcode:
No abstract at ADS
Title: The Magnetic Effect and Shock Wave of a Meteor
Authors: Ivanov, V. V.; Medvedev, Yu. A.
Bibcode: 1965SvA.....8..890I
Altcode:
No abstract at ADS
Title: H-functions in the theory of resonance radiation transfer
Authors: Ivanov, V. V.; Nagirner, D. I.
Bibcode: 1965Ap......1...86I
Altcode:
No abstract at ADS
Title: Tables of Functions Encountered in the Theory of Resonance
Radiation Transfer. I.
Authors: Ivanov, V. V.; Shcherbakov, V. T.
Bibcode: 1965Ap......1...10I
Altcode:
No abstract at ADS
Title: Electric Effect of Large Meteoroids
Authors: Ivanov, V. V.; Medvedev, Yu. A.
Bibcode: 1965Ge&Ae...5..216I
Altcode:
No abstract at ADS
Title: Tables of Functions Encountered in the Theory of Resonance
Radiation Transfer. II.
Authors: Ivanov, V. V.; Shcherbakov, V. T.
Bibcode: 1965Ap......1...17I
Altcode:
No abstract at ADS
Title: Light Scattering in a Plane Layer
Authors: Ivanov, V. V.
Bibcode: 1964SvA.....8...32I
Altcode:
No abstract at ADS
Title: Scattering of Light in an Atmosphere of Finite Optical
Thickness
Authors: Ivanov, V. V.
Bibcode: 1964AZh....41.1097I
Altcode:
No abstract at ADS
Title: The Magnetic Effect and Shock Wave of a Meteor
Authors: Ivanov, V. V.; Medvedev, Yu. A.
Bibcode: 1964AZh....41.1118I
Altcode:
No abstract at ADS
Title: Light Scattering in a Plane Layer
Authors: Ivanov, V. V.
Bibcode: 1964AZh....41...44I
Altcode:
No abstract at ADS
Title: The Third Plenum of the Commission on the Physics of Stars
and Nebulae
Authors: Ivanov, V. V.
Bibcode: 1963SvA.....7..304I
Altcode:
No abstract at ADS
Title: Diffusion of Resonance Radiation in Stellar and Nebular
Atmospheres. II. A Layer of Finite Thickness
Authors: Ivanov, V. V.
Bibcode: 1963SvA.....7..199I
Altcode:
No abstract at ADS
Title: Diffusion of Resonance Radiation in Stellar Atmospheres and
Nebulae. I. Semiinfinite Medium
Authors: Ivanov, V. V.
Bibcode: 1963SvA.....6..793I
Altcode:
No abstract at ADS
Title: On Gordon and Pichakhchi's Paper, "Emission by Hydrogen Atoms
Excited by Synchrotron Radiation from Relativistic Electrons
Authors: Ivanov, V. V.
Bibcode: 1963SvA.....6..597I
Altcode:
No abstract at ADS
Title: The Third Plenum of the Commission on the Physics of Stars
and Nebulae
Authors: Ivanov, V. V.
Bibcode: 1963AZh....40..396I
Altcode:
No abstract at ADS
Title: Diffusion of Resonance Radiation in Stellar and Nebular
Atmospheres. II. A Layer of Finite Thickness
Authors: Ivanov, V. V.
Bibcode: 1963AZh....40..257I
Altcode:
No abstract at ADS
Title: Diffusion of Resonance Radiation in Stellar Atmospheres and
Nebulae. I. Semiinfinite Medium
Authors: Ivanov, V. V.
Bibcode: 1962AZh....39.1020I
Altcode:
No abstract at ADS
Title: On Gordon and Pichakhchi's Paper, "Emission by Hydrogen Atoms
Excited by Synchrotron Radiation from Relativistic Electrons
Authors: Ivanov, V. V.
Bibcode: 1962AZh....39..767I
Altcode:
No abstract at ADS
Title: Chromospheric Line Profiles
Authors: Ivanov, V. V.
Bibcode: 1961SvA.....4..954I
Altcode:
No abstract at ADS
Title: Chromospheric Line Profiles
Authors: Ivanov, V. V.
Bibcode: 1960AZh....37.1021I
Altcode:
No abstract at ADS