Physics
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5.1055h&link_type=abstract
Geophysical Research Letters, vol. 5, Dec. 1978, p. 1055-1057. Budesministerium für Forschung und Technologie
Physics
5
Cosmology, Heavy Ions, Radiation Belts, Solar Wind, Trapped Particles, Adiabatic Conditions, Atmospheric Composition, Carbon, Energy Dissipation, Energy Spectra, Nucleons, Oxygen
Scientific paper
Analysis of data from our energetic ion composition experiment on ISEE-1 has revealed the presence of substantial fluxes of carbon, oxygen, and heavier ions above 400 keV/nucleon at L values between approximately 2.5 and 4 earth radii. The measured C/O ratio varies systematically from 1.3 at 450 keV/nucleon to 4.1 at 1.3 MeV/nucleon, and no iron is observed above 200 keV/nucleon. These results provide strong evidence for a solar wind origin for energetic ions in the outer radiation belt. The absence of iron and the increase of the carbon-to-oxygen ratio with energy suggest that the condition for the validity of the first adiabatic invariant may have a strong influence on the trapping of these particles.
Fan Chang-Yun
Fisk Len A.
Gloeckler George
Hovestadt Dieter
Ipavich Fred M.
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