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Plasma electron signatures of magnetic connection to the Jovian bow shock: Ulysses observations
Authors:Mark B Moldwin  Earl E Scime  Samuel J Bame  John T Gosling  John L Phillips  Andr Balogh
Institution:Mark B. Moldwin, Earl E. Scime, Samuel J. Bame, John T. Gosling, John L. Phillips,André Balogh
Abstract:Ulysses plasma electron observations of bidirectional and enhanced unidirectional electron heat fluxes within 4500 RJ (0.8 a.u. or 3 months on either side of closest approach) of Jupiter are presented as evidence for the magnetic connection of the spacecraft to the Jovian bow shock. These bursts of suprathermal electrons (> 30 eV) are observed when the interplanetary magnetic field points roughly parallel or antiparallel to the Jupiter-spacecraft line. Ninety-eight possible connection events were found over the 6 month period centered on the closest approach to Jupiter. The frequency of occurrence peaked with proximity to the bow shock, with most events occurring post-encounter. These are the first observations of backstreaming suprathermal electrons made in the vicinity of the Jovian bow shock.
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