Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1583c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 15, p. 1583-1586
Physics
15
Earth Magnetosphere, Energetic Particles, Geomagnetism, Helium Ions, Magnetically Trapped Particles, Crres (Satellite), Energy Spectra, Ion Injection, Magnetic Storms, Power Series, Solar Flares, Solar Wind
Scientific paper
High energy (approximately 40-100 MeV/nucleon) geomagnetically trapped helium nuclei have been measured, for the first time, by the ONR-604 instrument during the 1990/1991 Combined Release and Radiation Effects Satellite (CRRES) mission. The helium events observed at L less than 2.3 have a pitch angle distribution peaking perpendicular to the local magnetic field and are contained in peaks located at L = 1.2 and 1.9. The events in each peak can be characterized by power law energy spectra with indices of 10.0 +/- 0.7 for L = 1.9-2.3 and 6.8 +/- 1.0 for L = 1.15-1.3, before the large storm of 24 March 1991. CRRES was active during solar maximum when the anomalous component is excluded from the inner heliosphere, making it unlikely that the observed events derived from the anomalous component. The trapped helium counting rates decrease gradually with time indicating that these high energy ions were not injected by flares during the 1990/91 mission. Flare injection prior to mid-1990 may account for the highest energy particles, while solar wind injection during magnetic storms and subsequent acceleration could account for the helium at lower energies.
Chen Jiasheng
Cooper John F.
Gregory Guzik T.
Sang Yeming
Wefel John P.
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