Experimental determination of geomagnetically trapped energetic heavy ion fluxes

Details Experimental determination of geomagnetically trapped energetic heavy ion fluxes Experimental determination of geomagnetically trapped energetic heavy ion fluxes

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983eice.conf..369s&link_type=abstract

IN: Energetic ion composition in the earth's magnetosphere (A84-37001 17-46). Tokyo/Dordrecht, Terra Scientific Publishing Co./D

Computer Science

2

Energetic Particles, Heavy Ions, Ion Temperature, Magnetospheric Ion Density, Radiation Belts, Energy Spectra, Helium Ions, Ion Distribution, Magnetic Equator, Magnetic Storms, Mass Spectroscopy, Proton Belts

Scientific paper

The observed spatial, directional and spectral characteristics of geomagnetically trapped heavy ions are reviewed. It is found that ions heavier than protons are significantly abundant in the earth's radiation belts, not only at low (ring-current) energies, but also at multi-MeV energies. Observations both at the geomagnetic equator and at low altitudes on the corresponding L-shell show the important roles played by the heavy ions. The heavy ion-to-proton flux ratio can exceed unity when compared at equal total ion energy. This is particularly the case at several MeV energies and in the outer radiation zone. In contrast, comparisons at equal energy per nucleon generally favor protons. The trapped fluxes of helium ions, of carbon, nitrogen and oxygen (CNO) ions, and of ions heavier than fluorine all exhibit high degrees of pitch angle anisotropy. Many of the observed radiation belt particle distribution characteristics are in agreement with first-order (quiet time) theoretical predictions, although some of the finer details await further research.

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