Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm23a1909l&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM23A-1909
Physics
Plasma Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2756] Magnetospheric Physics / Planetary Magnetospheres, [6275] Planetary Sciences: Solar System Objects / Saturn, [7833] Space Plasma Physics / Mathematical And Numerical Techniques
Scientific paper
Plasma corotation flow around Saturn is analyzed using a non-linear, least squares fitting routine based on the Levenberg-Marquardt algorithm, tailored specifically for data from the Cassini Plasma Spectrometer (CAPS). The program assumes the plasma to consist of two species, a light group (H+) and a water group (W+) corotating at the same velocity. It uses one-dimensional Maxwell-Boltzmann distributions to model both ion species and derive the corresponding plasma moments (density, velocity, temperature). Assumption of equal velocity for both distributions is used to infer the spacecraft potential. Results derived by the algorithm are presented for six years of CAPS data, from all longitudes, between 3-10 Saturn radii (RS) and ±10° latitude. The derived spacecraft potential is compared to results observed by other instruments on Cassini.
Bagenal Fran
Burch James. L.
Crary Frank J.
DeJong Anna D.
Goldstein Jeffrey Jay
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