Low-energy ions at low equatorial altitudes

Details Low-energy ions at low equatorial altitudes Low-energy ions at low equatorial altitudes

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..703w&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, July 1988, p. 703-713.

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1

Earth Magnetosphere, Equatorial Atmosphere, Low Altitude, Magnetospheric Ion Density, Energy Spectra, International Sun Earth Explorer 1, Plasma-Electromagnetic Interaction

Scientific paper

Ion mass composition data, obtained with the ISEE-1 mass spectrometer, and other data are used to study the intense low-energy populations observed in the low-altitude equatorial magnetosphere by Williams and Frank (1984). The observed ions are identified primarily as H(+), O(+), and He(+). Observed peak energies are shown to increase with decreasing altitude and to vary by at least 30 percent over time. It is suggested that a mechanism of resonant wave-particle interaction is responsible for the energization of the observed ions, and that such a mechanism may act in a two-phase mode, resulting in the energization of minor ions up to the local Alfven energy of the ambient plasma.

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