Fast neutral particles as probes of the extent of Io's exosphere

Details Fast neutral particles as probes of the extent of Io's exosphere Fast neutral particles as probes of the extent of Io's exosphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003p%26ss...51..945c&link_type=abstract

Planetary and Space Science, Volume 51, Issue 14-15, p. 945-952.

Physics

Io Exosphere, Io Torus, Fast Neutrals, Ion Cyclotron Waves

Scientific paper

The spatial extent of ion cyclotron waves at Io has been interpreted as requiring a multistep acceleration and transport process: exospheric ions are accelerated outward (relative to Jupiter) due to the corotation electric field, neutralized due to charge exchange in the surrounding exosphere, and then reionized after traveling far across magnetic field lines, at which point they generate the waves. The trajectories of the particles away from Io are sensitive to the location of their initial ionization. This paper examines the spatial distributions of fast neutrals produced under varying conditions in order to provide constraints on the possible structure and nature of the Io exosphere. While a rapid onset of cyclotron waves at a specific location around Io can be modeled with a single, point-source region of ions, such as might occur over a volcano, the regional extent of the waves suggests multiple or distributed sources.

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