The Abundance of Atomic Sulfur in the Atmosphere of Io

Details The Abundance of Atomic Sulfur in the Atmosphere of Io The Abundance of Atomic Sulfur in the Atmosphere of Io

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.1706f&link_type=abstract

American Astronomical Society, DPS Meeting #33, #17.06; Bulletin of the American Astronomical Society, Vol. 33, p.1064

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope have been used to constrain the atomic sulfur column density in Io's atmosphere. The S 1 λ 1479 dipole allowed and forbidden transition multiplets have been resolved for the first time at Io, enabling the study of both optically thick and thin transitions from a single atomic species. The allowed transitions contribute 62 +/- 8% and the forbidden transitions 38 +/- 8%, on average, to the total signal of the S 1 λ 1479 multiplets. Using the optically thick and thin transitions of S 1 λ 1479 and S 1 λ 1814, we derive an atmospheric sulfur column abundance of 2.8x1012 cm-2 < N}s < 1.3x1013 cm-2, which is independent of electron temperature and density. A low density SO2 atmosphere, N}so2 ~ 5-10x1015 cm-2, consistent with that inferred from other recent observations, is most consistent with these bounds. Support for this work was provided by NASA through grant number HST-AR-09211.01-A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555.

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