Energetic Charged Particle Injections at Saturn

Details Energetic Charged Particle Injections at Saturn Energetic Charged Particle Injections at Saturn

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm32a..03p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM32A-03

Other

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2756 Planetary Magnetospheres (5443, 5737, 6033), 5719 Interactions With Particles And Fields, 5737 Magnetospheres (2756)

Scientific paper

The Cassini spacecraft has been in Saturn orbit for over 4 years. The Magnetospheric Imaging Instrument (MIMI) is a charged and neutral particle instrument with three separate sensors. On every perigee pass to date, data taken by MIMI reveal the presence of very recent and/or older charged particle injections. For our purposes, injections are spatially confined populations whose fluxes are recognizably greater than the fluxes of the ambient population. These populations are transient in nature and our previous work and the work of others has shown that they evolve essentially through the usual corotation and gradient-curvature drifts. However, it is not completely understood whether all of the injections observed by MIMI, in the few keV to MeV energy range, are associated with the same physical mechanism. Injections can, in principle, be caused by local accelerations of a fraction of the denser, lower energy particles. On the other hand, injections may also be associated with processes that transport particles radially, such as in magnetospheric flux tube interchange or large scale magnetospheric reconfigurations. In this paper, we will present a survey of the data set, an organization of the injections by their properties, and some hypotheses about how these properties reveal information about the underlying physical generation mechanisms.

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