HST/FOS Observations of Io in the Near Ultraviolet

Details HST/FOS Observations of Io in the Near Ultraviolet HST/FOS Observations of Io in the Near Ultraviolet

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.0912j&link_type=abstract

American Astronomical Society, DPS meeting #29, #09.12; Bulletin of the American Astronomical Society, Vol. 29, p.980

Astronomy and Astrophysics

Astronomy

Scientific paper

We present initial results arising from the comparison of four sets of Hubble Space Telescope/Faint Object Spectrograph near ultraviolet observations obtained in the four year period from August 1993 until October 1996. As an initial diagnositc, we have obtained the ratios of: small apeture (0.3") pre-COSTAR FOS/BL spectra of Pele and a known bright region, obtained on August 1993; disk integrated spectra of Io immediately after eclipse egress and 1 hour post egress obtained on October 1996 with FOS/RD; and disk integrated spectra of Io at eastern and western elongation obtained on 1994 with FOS/BL and again in October 1996 with FOS/RD. With these ratios, we have indentified the relative differences in the SO2 absorption signature within each individual data set, and temporally between each data set. Future work on these spectra will include careful evaluation and modeling of the geometric albedoes associated with each spectra. Comprehensive analysis and comparision of these results should provide constraints useful in separating the sublimation and volcanic components of Io's SO2 atmosphere, identifying the dominant source of SO2 gas and determining limits of the abundance and spatial distribution of the SO2 atmospheric component. This research has been supported by the STScI grants GO-5438 and GO-6786, and by the Univeristy of Michigan.

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