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Eclipse Spectroscopy of Io’s Atmosphere

Bouchez, Antonin H. and Brown, Michael E. and Schneider, Nicholas M. (2000) Eclipse Spectroscopy of Io’s Atmosphere. Icarus, 148 (1). pp. 316-319. ISSN 0019-1035. doi:10.1006/icar.2000.6518.

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High resolution optical (4193–6619 Å) spectra of Io in eclipse show auroral emission in five lines: [Oi] 6300, 6363, 5577 Å and Na 5889, 5896 Å. We conclude that Io's diffuse red emissions imaged by the Galileo Solid State Imager (P. E. Geissler et al. 1999, Science 285, 870–874) are due to impact or dissociative excitation of oxygen, while diffuse green emissions are caused by the impact or dissociative excitation of sodium. No emission lines were detected in the blue region of the spectra, suggesting that the intense emission observed above Io's equatorial plumes is due to a molecular species such as SO_2 or SO.

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Brown, Michael E.0000-0002-8255-0545
Additional Information:© 2000 Academic Press. Received January 31, 2000; revised August 18, 2000. We thank Teresa Chelminiak, Barbara Schaefer, and David Sprayberry for assistance with these difficult observations, K.L. Bell for supplying oxygen cross sections, and Paul Geissler and an anonymous reviewer for helpful suggestions on the manuscript. A.H.B. is supported by an NSF graduate research fellowship. The data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:Io; aurorae; Jupiter; magnetosphere
Issue or Number:1
Record Number:CaltechAUTHORS:20120926-105755057
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Official Citation:Eclipse Spectroscopy of Io's Atmosphere Pages 316-319 Antonin H Bouchez, Michael E Brown, Nicholas M Schneide
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34445
Deposited By: Ruth Sustaita
Deposited On:26 Sep 2012 18:13
Last Modified:09 Nov 2021 23:08

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