Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.5508j&link_type=abstract
American Astronomical Society, DPS meeting #30, #55.P08; Bulletin of the American Astronomical Society, Vol. 30, p.1448
Other
Scientific paper
Hubble Space Telescope/Faint Object Spectrograph (HST/FOS) near ultraviolet (NUV) disk integrated spectra of Io taken at east and west elongation were obtained in June, 1994 with the FOS/BL detector and in October, 1996 with the with FOS/RD detector utilizing the G190H grating; similarly, two sets of HST/FOS NUV disk integrated spectra of Io after eclipse egress were taken 1 hour apart in October 1996 with the FOS/RD detector and the G190H grating. We present the geometric albedoes derived from these data, as well as the SO_2 abundance that best reproduces the shape and contrast of the absorption bands apparent in the derived albedoes. Following the model in Ballester et al. (1994), our model includes the temperature dependence of the SO_2 absorption cross-section as determined from high-resolution lab data taken by Freeman et al. (1984) at 213K, and by Stark et al. (1998) at 300K; and, the frost distribution as determined from Voyager data published by McEwen et al. (1988). The geometric albedo, GA, is defined as: $ GA(lambda )={1/pi } int int [RSO_2(lambda )XSO_2(theta ,phi ) + R_x(lambda )X_x(theta ,phi )] {linebreak } S(2(lambda ,theta ,phi ) sin^2(phi )dtheta ) dphi where \theta (latitude) is in the range +/- 90^{\circ} and \phi (longitude) ranges from 0 to 180^{\circ}, RSO_2(\lambda) is the reflectance of SO_2 frost, XSO_2 is the spatial distribution of the SO_2 frost, R_x(\lambda) is the combined reflectance of the other unknown frosts and S is the atmospheric transmission. Utilizing the available SO absorption cross-sections, we find that the addition of a column of SO gas to the model atmospheric transmission increases our ability to reproduce the shape and contrast of several of the absorption bands apparent in the derived albedoes. We present the relative abundance of SO_2$ and SO for each of the observed elongations and egress observations, and compare the temporal variation between the data sets.
Ajello Joe
Ballester Gilda E.
Clarke John T.
Combi Michael
Lea Jessup Kandis
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