Day-night asymmetries of low-energy electrons in Saturn's inner magnetosphere

Details Day-night asymmetries of low-energy electrons in Saturn's inner magnetosphere Day-night asymmetries of low-energy electrons in Saturn's inner magnetosphere

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3808106d&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 8, CiteID L08106

Physics

Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

We examine the day-night asymmetry of near-equatorial low energy (12-100 eV) electron fluxes measured by Cassini from July 1, 2004 through April 1, 2010. This energy range is also known to be associated with interchange injections. The electrons are separated into field-aligned (0° to 20° and 160° to 180°) pitch angles and trapped (70° to 110°) pitch angles. There is a stronger day-night asymmetry for the trapped than the field-aligned electrons, but both show enhanced energy fluxes on the nightside relative to the dayside. The dayside electron fluxes decrease sharply at an L-shell of 8, while the nightside electrons exhibit a slow decline in to L = 5. Our finding, along with previous research of high energy electrons, shows that this asymmetry is energy independent. This suggests that interchange injections are stronger, and therefore penetrate deeper into the magnetosphere, on the nightside.

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