Other
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.6109l&link_type=abstract
Journal of Geophysical Research, vol. 87, Aug. 1, 1982, p. 6109-6120.
Other
54
Equatorial Atmosphere, Magnetic Variations, Magnetospheric Ion Density, Positive Ions, Charge Exchange, Geomagnetism, Helium Ions, Hydrogen Ions, International Sun Earth Explorer 1, Magnetic Dipoles, Mass Spectrometers, Oxygen Ions, Particle Energy, Plasma Composition, Ring Currents
Scientific paper
Data from the near-equatorial magnetosphere are analyzed by comparing the plasma composition during storm conditions with the composition during extended periods of low magnetic activity. It is found that at L less than or equal to 5, the O(+) is typically comparable to the H(+) in density and is often the dominant species, particularly during quiet times and at the inner edge of the region of significant fluxes. The He(+) in most cases contributes a significant fraction of the density and is sometimes the second most abundant species, following the O(+). Another finding is that both the He(+)/H(+) and the O(+)/H(+) ratios peak at the lowest L values and are, on the average, higher during quiet times than they are during the early main phase of major magnetic storms; this is seen as suggesting that charge exchange may be a significant loss process at low L. It is pointed out that the mean energies of the H(+), He(+), and O(+) ions often decrease gradually with decreasing L toward the inner edge of the energetic particle population.
Lennartsson W.
Sharp R. D.
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