Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21e..08p&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21E-08
Physics
2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2756 Planetary Magnetospheres (5443, 5737, 6033), 5737 Magnetospheres (2756)
Scientific paper
Electron data from the Cassini Magnetospheric Imaging Instrument (MIMI) reveal regular injections of tens to hundreds of keV particles deep into the magnetosphere of Saturn. Once injected, these electrons lag rigid corotation because their gradient-curvature drift is opposed to the sense of planetary rotation. Cassini regularly encounters both fresh injections and injections up to several days old. If, as in our model, electrons are injected at all L shells but approximately confined to a narrow group of longitudes, Cassini can miss new injections or encounter them once or twice on a single orbit. As injections evolve, all planetary longitudes begin to contain remnants of the original injection at some L shell. On a time-energy spectrogram of the orbit, an older injection will then appear at different energies and times. We have found using modeling that what initially appeared to us as distinct populations were really different parts of a single injection several days old. Our working hypothesis is that the vast majority of energetic electrons in the inner magnetosphere of Saturn are due to injections of various ages.
C:son Brandt Pontus
Krimigis Stamatios M.
Krupp Norbert
Mauk Barry H.
Mitchell Donald G.
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