Планетные исследования. Публикации
O.M.Starodubtseva,
L.A.Akimov, V.V.Korokhin, V.G.Tejfel (1994) SPATIAL AND
TEMPORAL VARIATIONS OF THE DEGREE OF LINEAR POLARIZATION FOR JUPITER
IN THE VISIBLE SPECTRAL RANGE. Kinematika Fizika Nebeshykh
Tel, 1994, v.10, No 2, pp.50-57
Polarimetric
observations of Jupiter were carried out using different technique
and different telescopes during apparitions of 1981, 1985, 1986
and 1989. Distributions of the linear polarization degree along
the central meridian for different longitudes were obtained. A
significant increase in the degree of linear polarization in polar
regions was confirmed. Polarization increases abruptly from latitudes
40 degree N and 47 degree S toward the poles. The north-south
asymmetry in the degree of polarization measured in polar regions
is revealed: the polarization in north polar region within the
5-6 of arcsec is larger than in south polar region at the same
latitudes. At low latitudes, the degree of linear polarization
correlates with the zone-belt structure. The data for 1989 show
the asymmetry in the phase angle dependence of polarization measured
at north and south hemispheres. Variations of polarization degree
in polar regions with the central meridian longitude reveal systematic
annual shift of modulation phase in the System III longitude and
stable characteristics of modulation in the System IY.
Стародубцева
О.М., Акимов Л.А., Корохин В.В., Тейфель В.Г. ПРОСТРАНСТВЕННЫЕ
И ВРЕМЕННЫЕ ВАРИАЦИИ СТЕПЕНИ ЛИНЕЙНОЙ ПОЛЯРИЗАЦИИ ЮПИТЕРА В ВИДИМОМ
СПЕКТРАЛЬНОМ ДИАПАЗОНЕ. Кинематика
и физика небесных тел. 1994. т.10. No 2. с.50-57.
O.M.Starodubtseva,
L.A.Akimov, V.V.Korokhin (1997-1) TIME VARIATIONS OF NORTH-SOUTH
DISSYMMETRY IN THE POLARIZED EMISSION OF JUPITER. Astronomicheskii
Vestnic, 1997, v.31, No 3, pp.214-221 [Solar System Research (Engl.
transl.), 1997, v.31, No 3, pp. - ]
Polarimetric
observations of Jupiter were carried out during eight apparitions
of the planet from 1981 to 1995. All data, except those obtained
in the summer of 1994, exhibit a north-south dissymmetry in the
polarized emission of Jupiter. Until 1994, the polarization degree
was greater in hight latitudes of the northern hemisphere than
in the same latitudes of the southern hemisphere. In 1994, the
dissymmetry was not observed almost at all.In 1995, the polarization
was higher in the southern hemisphere. The cause of the north-south
dissymmetry is unknown. However, the change in the chacter of
the dissymetry which was observed between 1993 and 1995 could
be related to the effect of the visit of comet Shoemaker-Levy
9 to the Jovian system. The possibility of correlation between
dissymmetry changes and the magnetic solar-activity cycle also
cannot be ruled out.
Стародубцева
О.М., Акимов Л.А., Корохин В.В. ВРЕМЕННЫЕ
ВАРИАЦИИ СЕВЕРО-ЮЖНОЙ АСИММЕТРИИ ПОЛЯРИЗОВАННОГО ИЗЛУЧЕНИЯ ЮПИТЕРА.
Астрон.
вестник. 1997. т.31. No 3. с.214-221.
O.M.Starodubtseva, L.A.Akimov,
V.V.Korokhin (1997-2) TEMPORAL
CHANGES IN THE NORTH-SOUTH ASYMMETRY OF POLARIZED LIGHT OF JUPITER
MAY BE ASSOCIATED WITH THE COMET SL9 VISIT TO THE JOVIAN SYSTEM.
Planetary
and Space Science, 1997, v.45, No 10, pp.1183-1188
Polarimetric
observations of Jupiter at blue wavelengths were taken during
the comet SL9 collision with the planet and compared with seven
other observations made during the period from 1981 to 1995. The
data show temporal variations in the north-south asymmetry of
polarization at high latitudes. Before 1993 - 1994 the polarization
degree near the north limb is greater than that for the symmetrical
regions near the south limb. In the July 1994 data the difference
between the polarization degrees at north and south vanished.
The observations of 1995 show the degree of polarization at south
latitudes to be greater than that at the same north latitudes.
These changes may be related to the increase of dust abundance
in the magnetosphere and stratosphere of Jupiter owing to the
comet SL9 visit to the Jovian system. However, correlation between
temporal variations of the polarization asymmetry and the magnetic
solar cycle cannot be ruled out.
Стародубцева
О.М., Акимов Л.А., Корохин В.В. Временные
вариации северо-южной асимметрии поляризованного излучения высокоширотных
областей Юпитера // Международная мемориальная научная конференция
"Астрономия 2000 года", 21 августа - 01 сентября 2000 г. Тезисы
докладов. Одесса. -2000. -С.16.
Поляризационные
наблюдения Юпитера в синей спектральной области проведены в течение
12 периодов видимости с 1981 по 1999гг. Данные обнаруживают северо-южную
асимметрию в поляризованном излучении планеты на высоких широтах
и ее временные вариации. Разница между степенью поляризации для
северных и южных точек с одинаковым углом падения света положительна
в период с 1981 по 1989гг., близка к нулю в 1993 и 1994 гг., отрицательна
в 1995 и 1996гг. и опять становится положительной в 1998 и 1999гг.
Среди возможных объяснений временных вариаций рассматриваются следующие:
зависимость от планетоцентрических склонений Земли и Солнца, зависимость
от расстояния Юпитера от Солнца, смена сезонов на планете, корреляция
с магнитным циклом солнечной активности, влияние падения кометы
Шумейкер - Леви 9 в атмосферу Юпитера и другие. Делается вывод о
сезонных изменениях величины асимметрии.
Rosenbush
V.K., Kiselev N.N., Jockers K., Korokhin V.V., Shakhovskoy N.M.,
and Efimov Yu.S. Optical polarimetry of the Galilean satellites,
Iapetus, and 64 Angelina near opposition // Kinematics and
Physics of Celestial Bodies. Supplement Series . - 2000, No3,
-p. 227-230.
Starodubtseva
O.M., Akimov L.A., Korokhin V.V. Seasonal variations in
the N/S asymmetry of polarized light of Jupiter // Lunar and
Planet. Sci. 31-th. Abstract #1095. 2001. LPI. Houston.
Seasonal
changes in the north-south asymmetry of polarization at high latitudes
of Jupiter are revealed from polarimetric observations in blue
light made over a 18yr period. They are seemingly caused by seasonal
north-south asymmetry in solar radiation incident on Jupiter's
atmosphere.
Starodubtseva
O.M., Akimov L.A., Korokhin V.V. Seasonal
variation to the North-South asymmetry of polarized light of Jupiter
// Icarus.-2002. v.157, No2, -p.419-425.
Seasonal
changes in the north-south asymmetry of polarization at high latitudes
of Jupiter have been revealed from polarimetric observations in
the blue light made over 18-year period. The average seasonal
difference in the polarization degree between north and south
is positive and equal to about 0.5%. There is some relationship
between seasonal variations in the observed difference and the
seasonal north-south asymmetry in solar radiation incident on
Jupiter's atmosphere. There are two maxima on observed seasonal
curve falling on the jovian spring and autumn and coinciding correspondingly
with positive and negative maxima of heliographic latitude of
Jupiter. Two possible explanations are discussed: seasonal changes
in insolation and/or time-dependent magnetospheric influence on
the polar events.
Поляриметрические
наблюдения, проведенные в голубом свете в течение 18-летнего периода,
обнаружили сезонные вариации в северо-южной асимметрии поляризации
на высоких широтах Юпитера. Средне-сезонное значение разницы степени
поляризации для северного и южного полушарий положительно и равняется
примерно 0.5%. Два максимума на наблюденной сезонной кривой приходятся
на юпитерианские весну и осень и совпадают соответственно с положительным
и отрицательным гелиографическими максимумами Юпитера. Имеется
некоторая связь между сезонными вариациями наблюденных различий
в степени поляризации и сезонными изменениями северо-южной асимметрии
солнечного излучения, падающего на атмосферу Юпитера. Обсуждаются
два возможных объяснения: сезонные изменения в инсоляции и/или
зависящее от времени влияние магнитосферы на события в полярной
области.
2002/06/08
