Physics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..457f&link_type=abstract
Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 457-468.
Physics
26
Jupiter Atmosphere, Magnetospheric Proton Density, Pioneer 10 Space Probe, Planetary Magnetospheres, Plasma Probes, Decametric Waves, Electrostatic Probes, Europa, Io, Planetary Magnetic Fields, Plasmapause, Proton Energy, Ring Currents, Solar Wind
Scientific paper
This paper presents an analysis of observations of large intensities of low-energy protons deep within the Jovian magnetosphere which were made by Pioneer 10 with an electrostatic plasma analyzer having an energy range from 108 eV to 4.80 keV. A proton density profile plotted against the earth-received time of the satellite signals reveals four significant plasma features: (1) a 'plasmasphere' with relatively high proton densities, located inside the flux tubes of Io at 6 Jupiter radii and extending toward the planet to at least 2.8 radii; (2) a 'plasmapause', on which Io's flux tubes are positioned; (3) a sparse sporadic zone beyond Io, extending out to 8 Jupiter radii; and (4) a ring current beginning at 8 radii, which extends outward in the form of a thin plasma disk and in which Europa is embedded. The thermal energies of the protons in each zone are determined, and it is suggested that Jupiter's ionosphere is the source of these protons. It is noted that the relationship of Io to the 'plasmapause' is probably of fundamental importance to that satellite's modulation of Jovian decametric radio emissions.
Ackerson K. L.
Frank Louis A.
Mihalov John D.
Wolfe John H.
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