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Mutual Event Observations of Io's Sodium Corona

Burger, M. H. and Schneider, N. M. and de Pater, I. and Brown, M. E. and Bouchez, A. H. and Trafton, L. M. and Sheffer, Y. and Barker, E. S. and Mallama, A. (2001) Mutual Event Observations of Io's Sodium Corona. Astrophysical Journal, 563 (2). pp. 1063-1074. ISSN 0004-637X. doi:10.1086/323944.

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We have measured the column density profile of Io's sodium corona using 10 mutual eclipses between the Galilean satellites. This approach circumvents the problem of spatially resolving Io's corona directly from Io's bright continuum in the presence of atmospheric seeing and telescopic scattering. The primary goal is to investigate the spatial and temporal variations of Io's corona. Spectra from the Keck Observatory and McDonald Observatory from 1997 reveal a corona that is only approximately spherically symmetric around Io. Comparing the globally averaged radial sodium column density profile in the corona with profiles measured in 1991 and 1985, we find that there has been no significant variation. However, there appears to be a previously undetected asymmetry: the corona above Io's sub-Jupiter hemisphere is consistently more dense than above the anti-Jupiter hemisphere.

Item Type:Article
Related URLs:
URLURL TypeDescription
de Pater, I.0000-0002-4278-3168
Brown, M. E.0000-0002-8255-0545
Additional Information:© 2001 American Astronomical Society. Received 2000 October 6; accepted 2001 August 17.
Subject Keywords:planets and satellites: individual (Io); techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20120926-114414934
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Official Citation:Mutual Event Observations of Io's Sodium Corona M. H. Burger et al. 2001 ApJ 563 1063
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34461
Deposited By: Ruth Sustaita
Deposited On:26 Sep 2012 20:09
Last Modified:09 Nov 2021 23:08

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