Local-Time Dependence of Ion Plasma Parameters at Saturn

Details Local-Time Dependence of Ion Plasma Parameters at Saturn Local-Time Dependence of Ion Plasma Parameters at Saturn

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm11a1989t&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM11A-1989

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [5737] Planetary Sciences: Fluid Planets / Magnetospheres

Scientific paper

A recent survey of the bulk plasma ion properties observed by the Cassini CAPS instrument over roughly the first 4 1/2 years of its mission in orbit around Saturn [Thomsen et al., 2010] is expanded to consider the dependence of several of the parameters on local time as well as radial distance. The moments (density, temperature, flow velocity) of the plasma distributions below 50 keV have been computed by numerical integration of the observed counts in the "Singles" (non-mass-resolved) data, partitioned into species on the basis of concurrent determinations of the composition from the Time-of-Flight data. Moments are presented for three main species: H+, W+ (water-group ions), and ions with m/q=2. One noteworthy finding is a tendency for nightside temperatures in the inner magnetosphere (r<13 Rs) to be appreciably higher than the dayside temperatures, an asymmetry that may be a consequence of an average convection pattern, fixed in local time, in Saturn's inner magnetosphere. Such a pattern is consistent with a number of other lines of evidence from several different Cassini instruments.

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