Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p11a..02m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P11A-02
Physics
2756 Planetary Magnetospheres (5443, 5737, 6030), 6218 Jovian Satellites
Scientific paper
The Galileo satellite flew over the polar cap of Jupiter's moon Io on August 5, 2001. Closest approach was approximately 200 km. Data was recorded throughout the encounter and will be transmitted to Earth over the next several weeks. An additional polar encounter is planned on 14 October 2001. Energetic particle measurements on previous low latitude encounters have shown 1) the existence of intense bi-directional electron beams along field lines in Io's wake; 2) the concurrent existence on the wake field lines of a trapped electron distribution; 3) an electron pitch angle distribution evolution that is consistent with the adiabatic response of the ambient Jovian electrons to the changing magnetic and electric field conditions throughout the encounter; 4) the existence of a region near the moon that is inaccessible to the adiabatically transported electron population; 5) evidence that the electron beams observed in the wake, while not directly responsible for the Io footprint aurora, do comprise a downward current that is an integral part of the electric circuit between Io and Jupiter. We will present the polar cap results and discuss their impact on these earlier conclusions.
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