Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2579f&link_type=abstract
Journal of Geophysical Research, Volume 83, Issue A6, p. 2579-2583
Physics
3
Scientific paper
Fluxes of geomagnetically trapped energetic helium ions in the immediate vicinity of the geomagnetic equator have been unambiguously identified and measured with Explorer 45. The observations presented span and L shell range 2.25<~L<~5 and extend the observational coverage of radiation belt helium ions. During geomagnetically quiescent conditions these fluxes are found to peak sharply near L=3.25 with equatorially mirroring intensities of 80 and 34 ions/cm2 s sr keV in the 1.16-1.74 MeV and 1.74-3.15 MeV per particle passbands, respectively. The helium ion fluxes are observed to exhibit a significant B/B0 dependence and indicate that the ion flux pitch angle distribution j (α) is very anisotropic. If j (α) ?j⊥ sinm α, then m values of 8 and 10 correspond to the responses of the two passbands within the B/B0 range of 1.0-1.4 observed. When the B/B0 dependence is removed, the fluxes exhibit no detectable decay over a 2-week period covered by the study.
Fritz Theodore A.
Spjeldvik Walther N.
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