The Variation of Io's Auroral Footprint Brightness with the Location of Io in the Plasma Torus

Details The Variation of Io's Auroral Footprint Brightness with the Location of Io in the Plasma Torus The Variation of Io's Auroral Footprint Brightness with the Location of Io in the Plasma Torus

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p11a0092s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P11A-0092

Physics

5706 Aurorae, 5719 Interactions With Particles And Fields, 6218 Jovian Satellites

Scientific paper

Observations of Jupiter`s aurora with HST/STIS since 1997 have shown bright and variable UV auroral emissions from the magnetic footprint of Io. The STIS images have sufficient angular resolution and sensitivity to perform a high quality comparison of the brightness of these emissions with various parameters related to Io, such as the location of Io in the plasma torus, its latitude, its local time, etc. Such correlations can be used to determine the nature of the complex electromagnetic interaction of Io with Jupiter's magnetic field and the plasma torus. Several corrections must be applied to the images for a self-consistent study, including mapping and projection of the location on the planet for a consistent view and a correction for limb brightening of the optically thin emissions as seen from the earth. These have been carefully tested and applied, after which one and only one correlation has been found. The footprint auroral emissions appear brightest when Io is centered in the plasma torus, indicating both that the interaction is strongest and that the current and/or particle acceleration communicated to the planet is greatest in this orientation. The results of this study will be presented along with discussion of the different theoretical models for the Io interaction.

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