Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.4628l&link_type=abstract
Journal of Geophysical Research, vol. 86, June 1, 1981, p. 4628-4638. Swiss National Science Foundation
Physics
56
Energy Distribution, Geomagnetism, Magnetic Storms, Magnetospheric Ion Density, Plasma Composition, Space Plasmas, Equatorial Atmosphere, Helium Ions, Hydrogen Ions, International Sun Earth Explorer 1, Ion Temperature, Ionospheric Currents, Ionospheric Drift, Oxygen Ions, Plasma Currents, Solar Wind
Scientific paper
Data from the plasma composition experiment of ISEE 1 are used to investigate the relative quantities and energy characteristics of H(+), He(++), He(+), and O(+) ions in the near-equatorial magnetosphere during magnetic storm conditions. The ions in the study had energies between 0.1 and 17 keV/e and pitch angles between 45 and 135 deg. The data were obtained during 10 storms, for the most part at or immediately following the peak Dst, covering all major local time sectors and geocentric distances between 2 and 15 earth radii. The ion fluxes are averaged over the spacecraft spin angle and over time for periods ranging from about 20 min close to the earth to more than an hour in most distant regions. The inferred 'isotropic' number densities are characterized by a large to dominant fraction of terrestrial ions throughout the energy range covered. The data are found to be consistent with a terrestrial origin for all of the O(+), most of the He(+), and a large but varying fraction of the H(+), whereas the He(++) and part of the H(+) appear to be of solar wind origin.
Balsiger Hans
Johnson Richard G.
Lennartsson W.
Sharp R. D.
Shelley Edward G.
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