Jovian Chromophore Characteristics from Multispectral HST Images

Details Jovian Chromophore Characteristics from Multispectral HST Images Jovian Chromophore Characteristics from Multispectral HST Images

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3107s&link_type=abstract

American Astronomical Society, DPS meeting #42, #31.07; Bulletin of the American Astronomical Society, Vol. 42, p.1011

Astronomy and Astrophysics

Astronomy

Scientific paper

Characterizing the chromophores responsible for coloring the Jovian atmosphere remains a challenging problem. In this study, we used radiative transfer models to derive spectral shapes of chromophore particles at seven wavelengths in the visible regime from HST WFPC2 data. The observations we selected are from 15 May, 28 June, and 08 July 2008, covering a passage of Oval BA and the Great Red Spot, and include nine filters: F255W, F343N, F375N, F390N, F410M, F437N, F469N, F502N, and F673N. We employed a forward-modeling approach using an adding-doubling radiative transfer code developed to analyze Galileo SSI data (Simon-Miller et al. 2001, Icarus 154, 459). We adopted a model atmosphere with three aerosol layers: a stratospheric haze, upper tropospheric haze, and tropospheric cloud. We parametrized each aerosol layer by a base pressure, optical depth, particle radius, and particle color (a single scattering albedo at each wavelength). For filters F375N-F673N, we assumed the chromophore (non-white) component resides solely in the upper tropospheric haze. We present derived particle colors for Jovian locations with a large variation in observed color and a discussion of the number of independent chromophores necessary to produce the variations in derived particle color. This work was supported by NASA's Planetary Atmospheres Program through grant number NNX08AF53A. This work is based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program #GO/DD11498.

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