Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.1408s&link_type=abstract
American Astronomical Society, DPS meeting #41, #14.08
Astronomy and Astrophysics
Astronomy
Scientific paper
Understanding of scattering properties of aerosols in Jovian atmosphere is essential to derive vertical cloud structure and optical properties of aerosols. The limitation of solar phase angle (0-12°) prevents us from determining the scattering phase function of aerosols by ground-based observation. Most studies have used the scattering phase function obtained by the Pioneer 10 Imaging Photopolarimeter (IPP) data (Tomasko et al., 1978). To provide a new reference scattering phase function with new imaging data, we have analyzed the Cassini Imaging Science Subsystem (ISS) imaging data obtained at BL1 (451 nm) and CB2 (750 nm) over wide solar phase angles (12-137°) during its Jupiter flyby in 2000-2001. At first step of our analysis, we adopted a simple cloud model, which consists of Rayleigh gas layer above a semi-infinite cloud layer, called as "Type I” in Tomasko et al. (1978). For the South Tropical Zone, we performed radiative transfer calculation with adding-doubling method to fit theoretical limb-darkening curves to observed ones at 11 solar phase angles for each wavelength, and optimized free parameters of scattering phase function approximated by two-term Henyey Greenstein function. In this presentation, we will show these results and discuss scattering properties of aerosols through comparison with results of Tomasko et al. (1978).
Kasaba Yasumasa
Sato Takao M.
Satoh Takao
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