Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.5095f&link_type=abstract
Journal of Geophysical Research, vol. 87, July 1, 1982, p. 5095-5101.
Physics
10
Angular Distribution, Geomagnetism, Helium Ions, Magnetically Trapped Particles, Pitch (Inclination), Anisotropic Media, Particle Energy, Radiation Belts, Satellite Observation
Scientific paper
It is noted that during geomagnetically quiet conditions, energetic radiation belt helium ion fluxes at MeV energies have been found to exhibit characteristic radial profiles and large pitch angle anisotropies. Compiling data from many experiments, a systematic dependence of this anisotropy with helium ion energy is deduced. Provided a certain approximation holds for the observed pitch angle distributions, an empirical relation is deduced involving the helium ion energy. The range of the total ion energy here is 0.59-9 MeV (148-2250 keV per nucleon). These values are obtained for L shells in the range where L is approximately 2 to 5. The results are compared with theoretical expectations, and a qualitative explanation for the observed trend is suggested.
Fritz Teresa A.
Spjeldvik Walther N.
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