Physics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..799w&link_type=abstract
Geophysical Research Letters, vol. 5, Sept. 1978, p. 799-802.
Physics
3
Current Sheets, Jupiter Atmosphere, Planetary Magnetic Fields, Plasma Density, Energetic Particles, Magnetic Disturbances, Pioneer 10 Space Probe, Plasma Temperature, Proton Flux Density, Plasmas, Pioneer 10, Jupiter, Magnetosphere, Flux, Current Sheets, Particle Flux, Temperatures, Thickness, High Energy Particles, Dynamics, Magnetic Fields, Ions
Scientific paper
The equatorial current sheet, which Pioneer 10 repeatedly encountered on its outbound pass through the Jovian magnetosphere, frequently was associated with intense fluxes of energetic protons. Simultaneous observations of the changes in the energetic proton flux and in the magnetic-field magnitude demonstrate that the current sheet is embedded in a high-beta plasma in which high-energy (above 60 keV) ions frequently are the dominant constituents. Large differences in the plasma temperature and the thickness of this plasma sheet between encounters only 10 hours apart indicate that the Jovian plasma sheet is very dynamic on a time scale of hours. Occasional observations of significant temporal variations in the magnetic field and particle populations during periods within the plasma sheet may represent in situ observations of Jovian magnetic disturbances. Comparison with previous observations suggests that low-energy (not more than 5 keV) plasma contributes less than 3% to the current-sheet energy density.
Kivelson Margaret
Schardt A. W.
Walker Ray J.
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