Production of hydrogen ions at Io

Details Production of hydrogen ions at Io Production of hydrogen ions at Io

Publishing date

May 1999

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10410345f&link_type=abstract

Journals

Journal of Geophysical Research, Volume 104, Issue A5, p. 10345-10354

Science

Physics

Additional info 2

17

Additional info 3

Planetology: Solar System Objects: Jovian Satellites

Type

Scientific paper

Abstract

A flux of pickup hydrogen ions was detected during the close passage of the Galileo spacecraft past Jupiter's moon Io on December 7, 1995. These protons were detected in a region just prior to and after the spacecraft's traversal of the geometric shadow of the torus plasmas by the solid body of the moon. The presence of a hot ring of protons in velocity space in a plane perpendicular to the local magnetic field is evidence that these protons were produced by a charge exchange of the heavy ions of the torus with the Iogenic atmospheric density of atomic hydrogen. The corresponding proton flux due to this pickup process is characterized by a density of ~30 cm-3 and a bulk flow of 60 kms-1. The corresponding density of atomic hydrogen is estimated as 1×105cm-3. Total hydrogen loss from Io is estimated as 3×1025Hionss-1 or 50 gs-1. Two candidates for the source of atomic hydrogen from Io's surface are H2S and H2O.

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