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Energetic particle signatures at Ganymede: Implications for Ganymede's magnetic field
The Johns Hopkins University Applied Physics Laboratory, Laurel, MD
The Johns Hopkins University Applied Physics Laboratory, Laurel, MD
The Johns Hopkins University Applied Physics Laboratory, Laurel, MD
The Johns Hopkins University Applied Physics Laboratory, Laurel, MD
University of Kansas, Lawrence, KS
MPAe, Katlenburg‐Lindau, Germany
University of Alaska, Fairbanks, AK
The Johns Hopkins University Applied Physics Laboratory, Laurel, MD
Boston University, Boston, MA
Lucent Technologies, Murray Hill, NJ
Jet Propulsion Laboratory, Pasadena, CA
The second encounter of the Galileo satellite with the Galilean moon Ganymede provided energetic particle measurements showing effects due to the presence of that moon. Jovian corotation signatures, present on approach to and departure from the Ganymede system, suddenly become much smaller when Galileo enters what has been termed Ganymede's magnetosphere. The location of these transitions agrees with magnetopause crossings identified by the magnetometer and plasma wave instruments. In Ganymede's magnetosphere, energetic ion and electron distributions display loss cone signatures whenever the Energetic Particles Detector (EPD) views along the magnetic field line. The loss cone measurements are used to estimate Ganymede's surface magnetic field along the satellite track. The results agree with model projections to Ganymede's polar cap and support the existence of a Ganymede‐intrinsic magnetic field. An evolution from single to double loss cone also occurs with increasing electron energy.
Received 14 March 1997; accepted 27 June 1997; .
Citation: (1997), Energetic particle signatures at Ganymede: Implications for Ganymede's magnetic field, Geophys. Res. Lett., 24(17), 2163–2166.
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