Spatial Distribution of Ganymede's Ultraviolet Ozone Absorption from HST

Details Spatial Distribution of Ganymede's Ultraviolet Ozone Absorption from HST Spatial Distribution of Ganymede's Ultraviolet Ozone Absorption from HST

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.7005s&link_type=abstract

American Astronomical Society, DPS meeting #31, #70.05

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first global disk-resolved maps of the distribution of Ganymede's 2600 Angstroms absorption band, due probably to O_3 (Noll et al. 1997), obtained with STIS on HST. These data complement earlier disk-integrated UV spectra by IUE (Nelson et al. 1987) and HST (Noll et al. 1996), and Galileo UVS spectra of selected regions of the surface (Hendrix et al. 1999). STIS global image cubes of the leading and trailing hemispheres of Ganymede, obtained in November 1998, cover 1900 - 4000 Angstroms with a resolution of 640 km x 150 km x 15 Angstroms. We map the 2600 Angstroms O_3 band strength by dividing a 2500 +/- 80 Angstroms albedo image by the average of a 2070 +/- 80 Angstroms and 2930 +/- 80 Angstroms ``continuum'' albedo image. Fitting a polynomial to each albedo spectrum gives similar results. The band depth maps show the expected strong band on the trailing hemisphere and very weak band on the leading hemisphere, but without an obvious dependence on terrain type, or distance from the antapex within each hemisphere. On the trailing side, O_3 abundance is stronger at mid-latitudes (+/- 40(o) )than at either the equator or higher latitudes, and is thus different from the equatorially-concentrated trailing-side O_2 absorption (Calvin and Spencer 1997). The +/- 60(o) - 70(o) latitudes, where Hendrix et al. (1999) see a strong O_3 band, may be too foreshortened to be well seen in our data. Implications of these results for O_3 formation on Ganymede will be discussed.

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