Energetic helium isotopes trapped in the magnetosphere

Details Energetic helium isotopes trapped in the magnetosphere Energetic helium isotopes trapped in the magnetosphere

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10124787c&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A11, p. 24787-24800

Physics

15

Magnetospheric Physics: Energetic Particles, Trapped, Interplanetary Physics: Energetic Particles, Planetary, Magnetospheric Physics: Magnetosphere-Inner, Interplanetary Physics: Cosmic Rays

Scientific paper

Helium nuclei have been measured within the magnetosphere (L<=6) during the 1990/1991 CRRES mission over an energy range of ~40-100 MeV nucleon-1. The Office of Naval Research 604 instrument resolves helium isotopes with a mass resolution of ~0.1 amu. Each helium isotope can be represented by a power law energy spectrum, and the energy spectrum of the 3He is different from that of 4He; that is, the 3He/4He ratio is energy dependent. In the energy range 51-86 MeV/nucleon the 3He/4He ratio is 7.4+/-2.6 for L=1.15-1.3 and 2.2+/-0.6 for L=1.8-2.15. All observed helium events at L<2.65 show pitch angle distributions consistent with equatorially trapped ions, whereas the distributions at larger L values are more uniform, within a factor of 2. For 2.15

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