Pitch angle distributions of energetic electrons at Saturn

Details Pitch angle distributions of energetic electrons at Saturn Pitch angle distributions of energetic electrons at Saturn

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11601216c&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A1, CiteID A01216

Physics

2

Planetary Sciences: Fluid Planets: Magnetospheres (2756), Planetary Sciences: Fluid Planets: Aurorae, Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

Pitch angle distributions of energetic electrons (110-365 keV) at Saturn are statistically analyzed for 2005-2009. Using a nondipolar model magnetic field, pitch angle distributions are mapped to the magnetospheric equator and sorted by equatorial crossing distance. The results are quantified using a standard function for the pitch angle distribution, f(α) = AsinKα (where α is the pitch angle and K is the power). Inside of ˜10 RS, the distributions are mostly peaked at 90° (K < 0), signifying a trapping distribution. Outside of this distance, the distributions are mostly field aligned (K > 0) with maxima near 0° and 180°. The 10 RS boundary maps to Saturn's ionosphere at latitudes equatorward of the aurora. Very few “flat” distributions are observed (K ≈ 0). The pitch angle distributions are not as well organized in local time as they are in radial distance, but over the 5 year survey between 10 and 20 RS field-aligned distributions appear most often near midnight, while trapping distributions are found elsewhere.

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