In-situ observations of a neutral gas torus at Europa

Details In-situ observations of a neutral gas torus at Europa In-situ observations of a neutral gas torus at Europa

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..10l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 11, pp. 10-1, CiteID 1556, DOI 10.1029/2003GL017214

Physics

8

Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Magnetosphere Interactions With Satellites And Rings, Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6030), Planetology: Solar System Objects: Jupiter

Scientific paper

A persistent pattern in the pitch angle distributions of energetic protons near the orbit of Europa has been observed with the Energetic Particles Detector (EPD) on board the Galileo spacecraft during each of the Europa orbit crossings in the last 7 years. The proton fluxes at energies larger than 220 keV peak at equatorial pitch angles of 90° whereas fluxes of lower energy protons (80-220 keV) at this pitch angle are depleted. We propose that a Jupiter-surrounding neutral gas torus in the vicinity of the orbit of Europa is responsible for the depletion of energetic particle fluxes by charge exchange collisions. In order to reproduce the observed depletion signature an average neutral number density of 20 to 50 cm-3 is required.

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