Plasma Observations at Io With the Galileo Spacecraft

Details Plasma Observations at Io With the Galileo Spacecraft Plasma Observations at Io With the Galileo Spacecraft

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0110f&link_type=abstract

American Astronomical Society, DPS meeting #28, #01.10; Bulletin of the American Astronomical Society, Vol. 28, p.1054

Astronomy and Astrophysics

Astronomy

Scientific paper

Plasma measurements during the Io flyby on 7 December 1995 with the plasma analyzers (PLS) on board the Galileo spacecraft reveal the unexpected, exciting direct passage through the ionosphere of this Galilean satellite. The ionosphere is identified by a dense, cool plasma that is at rest with respect to Io. The composition exhibits O(++) , O(+) and S(++) , S(+) , and SO2(+) ions. In addition the energy densities of the plasmas in the vicinity of Io are much greater than previously suggested by previous Voyager measurements. These energy densities are sufficiently large to account for the decreases of magnetic field intensities that are observed with the Galileo magnetometer and initially interpreted in terms of an Io dipole moment. That is, there is no robust evidence for a magnetized interior for Io.

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