Probing the Mysteries of Io's Ionosphere With the Plasma Instrumentation on the Galileo Spacecraft

Details Probing the Mysteries of Io's Ionosphere With the Plasma Instrumentation on the Galileo Spacecraft Probing the Mysteries of Io's Ionosphere With the Plasma Instrumentation on the Galileo Spacecraft

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p11a..04f&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P11A-04

Other

5719 Interactions With Particles And Fields, 5737 Magnetospheres (2756), 5780 Tori And Exospheres, 6218 Jovian Satellites

Scientific paper

At the time of writing this abstract the measurements during the close flyby of Jupiter's moon Io had been just acquired with the Galileo recorder for subsequent transmission to Earth at much lesser telemetry rates. This flyby near Io's northern pole on August 6, 2001 and a future flyby near the southern pole on the following October 16 will provide the plasma measurements for this presentation. These in-situ observations of Io are expected to provide further insight into the nature of its ionosphere and the accompanying currents and charged particle acceleration. Surprises can be expected from these flybys. For example, the flyby with closest approach at 208 km on February 22, 2000 provided a direct passage through the thermal ions at the top of the ionosphere. A cool plasma was encountered with temperatures of about 2300 K, and in the range of the hotter temperatures for some volcanic plumes as recorded remotely with other Galileo instruments. The observations from the flybys in August and October at closest approaches of 200 km and 181 km, respectively, are eagerly awaited.

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