Physics
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2163w&link_type=abstract
Geophysical Research Letters, vol. 24, p. 2163
Physics
25
Energetic Particles, Magnetic Fields, Extraterrestrial Environments, Radiation Counters, Electron Energy, Energy Levels, Space Probes
Scientific paper
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.
Armstrong Thomas P.
Fritz Teresa A.
Krimigis Stamatios M.
Lanzerotti Louis J.
Mauk Barry H.
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