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Detailed Reference Information |
Schardt, A.W., Kurth, W.S., Lepping, R.P. and Maclennan, C.G. (1985). Particle acceleration in Saturn’s outer magnetosphere: In memoriam Alois Schardt. Journal of Geophysical Research 90: doi: 10.1029/JA090iA09p08539. issn: 0148-0227. |
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Numerous events attributed to particle acceleration were observed in the Saturnian magnetosphere during the outbound pass of Voyager 2 between ~20 RS and the magnetopause. For observations made between 25 and 40 RS a close correlation exists between impulsive injections of 0.35- to 2-MeV electrons, increases in the hot ion flux (28- to 215-keV), a dip in the magnetic field magnitude, and a signal in the 562-Hz channel of the Voyager 2 plasma wave instrument. Our explanation for these observations involves the release of magnetic energy, which heats the ion component of the plasma and accelerates electrons to energies of about 2 MeV. The field depression are caused by the diamagnetic effects of the hot ions. The ~562-Hz noise is due to electron plasma oscillations at the local plasma frequency excited by the streaming electrons. The noise moved to higher-frequency channels as the electron density rose when Voyager entered the dawnside boundary layer. Time dispersions seen between several of the effects indicate that the site of the acceleration event may have been at some distance from the point of observation. Interplanetary conditions during this time interval were highly unusual, since Saturn's magnetosphere was evidently embedded in the distant magnetotail of Jupiter. |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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