The structure of Io's corona

Details The structure of Io's corona The structure of Io's corona

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..298s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 298-315.

Astronomy and Astrophysics

Astrophysics

39

Coronas, Io, Jupiter (Planet), Sodium, Charge Coupled Devices, Eclipses, Emission Spectra, Spatial Distribution, Jupiter, Satellites, Io, Structure, Coronas, Diagrams, Sodium, Density, Models, Theoretical Studies, Symmetry, Atmosphere, Mixing, Altitude, Structure, Ionization, Transport, Eclipses, Parameters, Spectra, Geometry, Emissions, Thickness, Thermal Effects, Sputtering, Escape

Scientific paper

A spatial profile of the distribution of sodium in Io's corona has been constructed using measurements obtained during satellite mutual eclipses. The data reveal a fairly symmetric corona whose density falls steeply from the surface out to 6 r(Io) and more slowly outside. An upper limit of 700 km is placed on the exobase altitude, but the observations do not constrain the surface density. Several theoretical models adequately match some traits of the corona, but none satisfies all the observations. No strong upstream/downstream asymmetry of the corona is observed, so it is unlikely that the corona is primarily generated by the impact of corotating ions into the trailing hemisphere.

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