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Northrop & Fillius 1985
Northrop, T.G. and Fillius, W. (1985). Electrons and cosmic ray produced protons in Saturn’s inner magnetosphere. Journal of Geophysical Research 90: doi: 10.1029/JA080i012p12085. issn: 0148-0227.

The University of California Cerenkov detector on Pioneer 11 previously observed cosmic ray albedo neutron decay (CRAND) protons above 600 MeV in Saturn's inner magnetosphere, mixed with a poorly understood background of energetic electrons (Fillius and McIlwain, 1980). Here we separate the electron from the proton counts and establish the first-order angular distributions for each species. To do this, we use the theoretical relationships among the harmonic coefficients of the count rate as a function of spacecraft roll angle derived by Northrop (1985). The majority of the counts were electrons with energy above several MeV, i.e., with drift periods shorter than the satellite orbital resonance. The electrons have isotropic pitch angle distributions, and the protons pancake over most of the region between Mimas and the rings, although there is a small region of dumbbell proton distributions in the vicinity of Janus and Epimetheus.

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Journal of Geophysical Research
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