Characteristics of Particle Injections in Saturn's Magnetosphere

Details Characteristics of Particle Injections in Saturn's Magnetosphere Characteristics of Particle Injections in Saturn's Magnetosphere

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm43b..04c&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM43B-04

Physics

2740 Magnetospheric Configuration And Dynamics, 2756 Planetary Magnetospheres (5443, 5737, 6033), 6275 Saturn, 7845 Particle Acceleration, 7846 Plasma Energization

Scientific paper

We compare energetic ion measurements from numerous large and small scale impulsive particle injections to concurrent background ion fluxes at Saturn in order to examine possible interrelation of these injections to general magnetospheric circulation, convection, and the observed compositional variations throughout and between Cassini near-planet passes. The injections are one possible, specific contributor to the observed abundance differences in subsequent passes between singly-charged major ion species (atomic and diatomic hydrogen, oxygen, and water group) and singly-charged minor heavy-ion species (e.g., diatomic nitrogen and oxygen). At Earth, for example, ionized diatomic molecular NO+1 is extracted from its ionosphere, circulated, and injected mainly during intense, disturbed magnetospheric storm conditions when numerous injections occur. The same disturbance scenario might apply to Saturn and/or Titan in the Kronian magnetosphere. We use measurements from the Charge-Energy-Mass Spectrometer, CHEMS, to compare the ion differential energy spectra and ion composition within the injections to those of the concurrent, background magnetospheric/ring- current population in order to better understand the dynamic ion acceleration and transport processes in Saturn's magnetosphere. CHEMS, one of three sensors comprising the MIMI investigation on Cassini, determines the mass and charge state of ions in the range 3-220 keV/e.

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