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Sodium Emission from Io: Implications

McElroy, Michael B. and Yung, Yuk Ling and Brown, Robert A. (1974) Sodium Emission from Io: Implications. Astrophysical Journal Letters, 187 (3). L127-L130. ISSN 2041-8205. doi:10.1086/181414.

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The surface of lo may be covered with a layer of ammonia ice containing trace amounts of sodium potassium, and calcium; and atmospheric nitrogen could be formed as a photochemical product of ammonia photolysis. Intense sporadic sodium emission from Io can be excited by collisions involving vibrationally excited nitrogen molecules. These metastable molecules may be formed by electron impact, with electrons energized by an auroral mechanism. In order to account for the intensity ratio of the sodium doublet, it is necessary to invoke scattering in a thick gaseous envelope ejected by Io.

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Yung, Yuk Ling0000-0002-4263-2562
Additional Information:© 1974 The American Astronomical Society. Received 1973 November 29. This research was funded by the Atmospheric Sciences Section of the National Science Foundation under grant GA-33990X to Harvard University.
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Subject Keywords:abundances - Jupiter - satellites
Issue or Number:3
Record Number:CaltechAUTHORS:20140922-132821232
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49905
Deposited By: Tony Diaz
Deposited On:22 Sep 2014 20:34
Last Modified:10 Nov 2021 18:49

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