The Source of Protons at Io

Details The Source of Protons at Io The Source of Protons at Io

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p21b0376e&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P21B-0376

Physics

2732 Magnetosphere Interactions With Satellites And Rings, 6062 Satellites, 6218 Jovian Satellites

Scientific paper

The ionosphere of Io is known to be dominated by the molecule ion of sulfur dioxide and the surface and atmosphere are nearly devoid of hydrogen bearing molecules. It is noteworthy, therefore, that electromagnetic waves have been observed near the second and fourth harmonics of the proton gyrofrequency, which is indicative of the presence of a population of pickup protons. We investigate the possible sources of indigenous hydrogen atoms and protons in the exosphere of Io and conclude that charge exchange between incident torus oxygen ions and a population of bound iogenic hydrogen atoms is the only mechanism that can suffice to provide the needed pickup proton source strength and number density. We evaluate various possible sources for such a population.

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