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The atmospheric signature of Io's Prometheus plume and anti-jovian hemisphere: evidence for a sublimation atmosphere☆ by Kandis Lea Jessup; John R. Spencer; Gilda E. Ballester; Robert R. Howell; Fred Roesler; Miquela Vigel; Roger Yelle is a Physics and Astronomy article available to read on EtoBox.

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Using the Hubble Space Telescope's Space Telescope Imaging Spectrograph we have obtained for the first time spatially resolved 2000-3000 Å spectra of Io's Prometheus plume and adjoining regions on Io's anti-jovian hemisphere in the latitude range 60 • N-60 • S, using a 0.1 slit centered on Prometheus and tilted roughly 45 • to the spin axis. The SO 2 column density peaked at 1.25 × 10 17 cm -2 near the equator, with an additional 5 × 10 16 cm -2 enhancement over Prometheus corresponding to a model volcanic SO 2 output of 10 5 kg s -1 . Apart from the Prometheus peak, the SO 2 column density dropped fairly smoothly away from the subsolar point, even over regions that included potential volcanic sources. At latitudes less than ±30 • , the dropoff rate was consistent with control by vapor pressure equilibrium with surface frost with subsolar temperature 117.3 ± 0.6 K, though SO 2 abundance was higher than predicted by vapor pressure control at mid-latitudes, especially in the northern hemisphere. We conclude that, at least at low latitudes on the anti-jovian hemisphere where there are extensive deposits of optically-thick SO 2 frost, the atmosphere is probably primarily supported by s

Who reads The atmospheric signature of Io's Prometheus plume and anti-jovian hemisphere: evidence for a sublimation atmosphere☆?

Author

Kandis Lea Jessup; John R. Spencer; Gilda E. Ballester; Robert R. Howell; Fred Roesler; Miquela Vigel; Roger Yelle

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV; Oxford University Press (OUP) (ISSN 0019-1035)

Published

2004

Language

EN

Field

Physics and Astronomy (Physical Sciences)