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Title:
Mutual Event Observations of Io's Sodium Corona
Authors:
Burger, M. H.; Schneider, N. M.; de Pater, I.; Brown, M. E.; Bouchez, A. H.; Trafton, L. M.; Sheffer, Y.; Barker, E. S.; Mallama, A.
Affiliation:
AA(Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309; , ), AB(Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309; , ), AC(Department of Astronomy, University of California, Berkeley, CA 94720; ), AD(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125; , ), AE(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125; , ), AF(Astronomy Department, University of Texas, Austin, TX 78712; , , ), AG(Astronomy Department, University of Texas, Austin, TX 78712; , , ), AH(Astronomy Department, University of Texas, Austin, TX 78712; , , ), AI(Raytheon Information Technology and Scientific Services, Lanham, MD 20706; )
Publication:
The Astrophysical Journal, Volume 563, Issue 2, pp. 1063-1074. (ApJ Homepage)
Publication Date:
12/2001
Origin:
UCP
ApJ Keywords:
Planets and Satellites: Individual: Io, Techniques: Spectroscopic
DOI:
10.1086/323944
Bibliographic Code:
2001ApJ...563.1063B

Abstract

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.
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