Io's sodium emission cloud and the Voyager 1 encounter

Details Io's sodium emission cloud and the Voyager 1 encounter Io's sodium emission cloud and the Voyager 1 encounter

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...44..305g&link_type=abstract

(IAU, American Astronomical Society, COSPAR, University of Hawaii, and NASA, Colloquium on the Satellites of Jupiter, 5th, Kailu

Astronomy and Astrophysics

Astronomy

19

Io, Satellite Atmospheres, Sodium Vapor, Space Plasmas, Voyager 1 Spacecraft, Emission Spectra, Planetary Environments, Plasma Density, Plasma Temperature, Satellite Surfaces, Velocity Distribution

Scientific paper

Monitoring of Io's neutral sodium emission cloud, monitored from two earth observatories during the period of the Voyager 1 encounter, demonstrated that the behavior of the cloud is complex; displaying a variety of changes, both systematic and secular, which can have both time and spatial dependencies while also possessing some characteristics of stability. Dynamic models of the sodium cloud employing Voyager 1 plasma data provide a reasonable fit to the encounter images of one of the observatories. The modeling assumptions of anisotropic ejection of neutral sodium atoms from the leading, inner hemisphere of Io, with a velocity distribution characteristic of sputtering, adequately explain the overall intensity distribution of the 'near cloud'.

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