Images of Excited H_3^+ at the Foot of the Io Flux Tube in Jupiter's Atmosphere

Details Images of Excited H_3^+ at the Foot of the Io Flux Tube in Jupiter's Atmosphere Images of Excited H_3^+ at the Foot of the Io Flux Tube in Jupiter's Atmosphere

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...262.1035c&link_type=abstract

Science, Volume 262, Issue 5136, pp. 1035-1038

Physics

130

Scientific paper

The electrodynamic interaction between Io and the Jovian magnetosphere drives currents to and from the planet's ionosphere, where H_3^+ emissaon is excited. Direct images of this phenomenon were obtained with the ProtoCAM infrared camera at the National Aeronautics and Space Administration's 3-m Infrared Telescope Facility. The emissions are localized to the instantaneous foot of the Io flux tube, ≈ 8^circ equatorward of the more intense auroral H_3^+ emission associated with higher magnetic latitudes. The foot of the Io flux tube leads that of (undisturbed) model magnetic field lines passing through Io by 15^circ to 20^circ in longitude and is less visible in the northern hemisphere at longitudes where the surface magnetic field strength is greatest. These data favor the unipolar inductor model of the Io interaction and provide insight into the source location and generation of Jovian decameter radio emission.

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