Near-infrared polarization studies of Saturn and Jupiter

Details Near-infrared polarization studies of Saturn and Jupiter Near-infrared polarization studies of Saturn and Jupiter

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...35..236k&link_type=abstract

Icarus, vol. 35, Aug. 1978, p. 236-271.

Astronomy and Astrophysics

Astronomy

Infrared Astronomy, Jupiter (Planet), Polarization Characteristics, Saturn (Planet), Albedo, Limbs, Planetary Radiation, Saturn Rings

Scientific paper

Polarization measurements of Jupiter, Saturn, and Saturn's rings from 1 to 3.5 microns are presented. At 1.6 microns on the disks of the two planets, the radially directed limb polarizations observed in the visible undergo, in some cases, a surprising 90 deg rotation to a tangential direction, particularly on the poles. The only immediate explanation for this effect is double Mie scattering, due to aerosols which must be of the order of a micrometer in size. On Jupiter the patterns are not uniform and are not stable, reflecting variable aerosol concentrations on the two poles. The ring polarization is uniformly negative (E vector parallel to the ecliptic plane) from the visible through 3.5 microns and is inversely proportional to the albedo. This is as expected from Wolff's model for scattering from rough solid surfaces, but the degree of polarization seems uncommonly high, exceeding 2% at 3.5 microns.

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