Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p43a0961c&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P43A-0961
Physics
2730 Magnetosphere: Inner, 2732 Magnetosphere Interactions With Satellites And Rings, 5737 Magnetospheres (2756), 6265 Planetary Rings, 6280 Saturnian Satellites
Scientific paper
During its first year in orbit, the Cassini spacecraft discovered that the rings and the icy satellites are the main sources of plasma in Saturn's magnetosphere. Based on the observations of an extensive neutral exosphere and plasma interaction around Enceladus, the plasma source from this satellite is of particular interest. Both the center of the E ring and Enceladus are 4 R_S from Saturn, therefore neither radial profiles of density, composition, or flux tube content, nor the presence of non-thermal velocity distributions at 4 R_S can clearly distinguish between the Enceladus and E ring sources. We present measurements of ion composition and velocity distribution, made by the Cassini Plasma Spectrometer, at 4 R_S and at various azimuthal distances from Enceladus. An E ring source (or an azimuthally symmetric neutral torus) would be independent of distance from Enceladus. A source at or near Enceladus should produce signatures which are most evident near Enceladus and which vary systematically with increasing eastward distance from that satellite.
Crary Frank J.
Goldstein Raymond
Hill Thomas W.
Smith Howard T.
Thomsen Michelle F.
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