Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.0309g&link_type=abstract
American Astronomical Society, DPS meeting #35, #03.09; Bulletin of the American Astronomical Society, Vol. 35, p.914
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We model HST STIS spectra of Mars taken on 18 August 2001 (Ls=216o) to retrieve the albedo, w, and asymmetry parameter, g, of the dust particles over the 220-305 nm wavelength range. The figure summarizes the combinations of w, g and τ (dust) that fit STIS spectra near the disk center and places our UV results in the context of the Pathfinder dust model (Tomasko et al., 1999). Our nominal case is τ =2.0, w=0.64, and g=0.84. We use Mie theory to calculate the change in w and g for the Tomasko et al. dust size distribution (a=1.6μ m, b=0.2) with wavelength shortward of 443.6 nm. The change in w and g from 443.6 to 260 nm requires that ni increase to 0.020 (from 0.0122). Future work will use MGS-TES IR dust opacity measurements to better constrain τ .
This work was supported in part by a grant from the STScI.
Clancy Todd R.
Goguen Jay D.
James Philip B.
Wolff Mike J.
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