Morphology and time variability of Io's visible aurora

Details Morphology and time variability of Io's visible aurora Morphology and time variability of Io's visible aurora

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10626137g&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 26137-26146

Physics

18

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Planetary Atmospheres, Magnetospheric Physics: Auroral Phenomena, Planetology: Solar System Objects: Jovian Satellites

Scientific paper

Clear-filter imaging of Io during the Galileo nominal and extended missions recorded diffuse auroral emissions in 16 distinct observations taken during 14 separate eclipses over a two year period. These images show that the morphology and time variability of the visible aurora have several similarities to Io's far ultraviolet emissions. The orbital leading hemisphere of Io is consistently brighter than the trailing hemisphere, probably due to a greater concentration of torus electrons in the wake region of the satellite. The locations of the polar limb glow and the bright equatorial glows appear to correlate with Io's System III longitude. Unlike the far ultraviolet emissions, the visible aurorae are enhanced near actively venting volcanic plumes, probably because of molecular emission by SO2.

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