Seasonal Variations in the North–South Asymmetry of Polarized Light of Jupiter

Starodubtseva, O. M.; Akimov, L. A.; Korokhin, V. V.

doi:10.1006/icar.2002.6820

Cited by 12 publications

(15 citation statements)

References 21 publications

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“…Previously, we showed that the values of the asymmetry parameter P N -P S seem to be well arranged if displayed depending upon the planetocentric orbital longitude of the Sun (Starodubtseva et al, 2002). Previously, we showed that the values of the asymmetry parameter P N -P S seem to be well arranged if displayed depending upon the planetocentric orbital longitude of the Sun (Starodubtseva et al, 2002).…”

Section: Long-term Variations In the North-south Asymmetry In The Degmentioning

confidence: 95%

“…The longitudinal dependence of polarization is observed (e.g., Starodubtseva et al, 2002). The longitudinal dependence of polarization is observed (e.g., Starodubtseva et al, 2002).…”

Section: Introductionmentioning

confidence: 95%

“…1) (Starodubtseva and Teifel, 1984;Teifel, 1985;Starodubtseva et al, 2002). The degree of linear polarization P sharply increases with latitude even at the zero-phase angle and in polar regions reaches its maximum, P = 7-8% (modulo), in the blue spectral range ( Fig.…”

Section: Introductionmentioning

confidence: 97%

“…At small phase angles (at least below 11° ) in the equatorial regions, the polarization practically vanishes (Morozhenko and Yanovitskii, 1973;Teifel, 1985;Starodubtseva and Teifel, 1984;Starodubtseva et al, 2002). At small phase angles (at least below 11° ) in the equatorial regions, the polarization practically vanishes (Morozhenko and Yanovitskii, 1973;Teifel, 1985;Starodubtseva and Teifel, 1984;Starodubtseva et al, 2002).…”

Section: Introductionmentioning

confidence: 97%

“…The long-term variations of the north-south asymmetry of polarization in the blue spectral range (440-470 nm) were found at phase angles close to zero using the multiyear photopolarimetric observations of Jupiter, which have been carried out at the Institute of Astronomy of Kharkiv National University since 1981 (Starodubtseva et al, 2002). The long-term variations of the north-south asymmetry of polarization in the blue spectral range (440-470 nm) were found at phase angles close to zero using the multiyear photopolarimetric observations of Jupiter, which have been carried out at the Institute of Astronomy of Kharkiv National University since 1981 (Starodubtseva et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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10.1007/s11208-008-1002-3

2010

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We present new results obtained from the analysis of the seasonal variations in the asymmetry of polarization of light reflected by Jupiter. From the 23-year set of observations, the anticorrelation between the asymmetries of polarization and insolation has been revealed. The mechanism explaining the observed seasonal variations of polarization has been proposed. The core of this mechanism is the effect of temperature changes in the planetary stratosphere on the processes of the stratospheric aerosol haze formation. Additional irregular factors that may influence the observed polarization asymmetry are considered. PACS numbers: 95.75. Hi, 96.15.Xy, 96.15.Hy, 96.30.Kf

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Section: Long-term Variations In the North-south Asymmetry In The Degmentioning

confidence: 95%

“…The longitudinal dependence of polarization is observed (e.g., Starodubtseva et al, 2002). The longitudinal dependence of polarization is observed (e.g., Starodubtseva et al, 2002).…”

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

10.1007/s11208-008-1002-3

2010

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Astrophysical polarimetry in Ukraine

Kiselev

Mishchenko

2011

Polarimetric Detection, Characterization and Remote Sensing

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Long slit spectropolarimetry of Jupiter and Saturn

Schmid

Joos

Buenzli

et al. 2011

Icarus

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We present ground-based limb polarization measurements of Jupiter and Saturn consisting of full disk imaging polarimetry for the wavelength 7300Å and spatially resolved (long slit) spectropolarimetry covering the wavelength range 5200 to 9350Å.For the polar region of Jupiter we find for λ = 6000Å a very strong radial (perpendicular to the limb) fractional polarization with a seeing corrected maximum of about +11.5 % in the South and +10.0 % in the North. This indicates that the polarizing haze layer is thicker at the South pole. The polar haze layers extend down to 58• in latitude. The derived polarization values are much higher than reported in previous studies because of the better spatial resolution of our data and an appropriate consideration of the atmospheric seeing. Model calculations demonstrate that the high limb polarization can be explained by strongly polarizing (p ≈ 1.0), high albedo (ω ≈ 0.98) haze particles with a scattering asymmetry parameter of g ≈ 0.6 as expected for aggregate particles of the type described by West and Smith (1991). The deduced particle parameters are distinctively different when compared to lower latitude regions.The spectropolarimetry of Jupiter shows a decrease in the polar limb polarization towards longer wavelengths and a significantly enhanced polarization in strong methane bands when compared to the adjacent continuum. This is a natural outcome for a highly polarizing haze layer above an atmosphere where multiple scatterings are suppressed in absorption bands. For lower latitudes the fractional polarization is small, negative, and it depends only little on wavelength except for the strong CH 4 -band at 8870Å.The South pole of Saturn shows a lower polarization (p ≈ 1.0 − 1.5 %) than the poles of Jupiter. The spectropolarimetric signal for Saturn decrease rapidly with wavelength and shows no significant enhancements in the fractional polarization in the absorption bands. These properties can be explained by a vertically extended stratospheric haze region composed of small particles < 100 nm as suggested previously by Karkoschka and Tomasko (2005).In addition we find in the V-and R-band a previously not observed strong polarization feature (p = 1.5 − 2.0 %) near the equator of Saturn. The origin of this polarization signal is unclear but it could be related to a seasonal effect.Finally we discuss the potential of ground-based limb polarization measurements for the investigation of the scattering particles in the atmospheres of Jupiter and Saturn.

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Seasonal Variations in the North–South Asymmetry of Polarized Light of Jupiter

Cited by 12 publications

References 21 publications

10.1007/s11208-008-1002-3

10.1007/s11208-008-1002-3

Astrophysical polarimetry in Ukraine

Long slit spectropolarimetry of Jupiter and Saturn

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