Substorm effects on the plasma sheet ion composition on March 22, 1979 (CDAW 6)

Details Substorm effects on the plasma sheet ion composition on March 22, 1979 (CDAW 6) Substorm effects on the plasma sheet ion composition on March 22, 1979 (CDAW 6)

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1243l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 1, 1985, p. 1243-1252. Research supported by the Lockheed Indepe

Physics

27

Magnetic Storms, Magnetospheric Ion Density, Plasma Composition, Plasma Layers, Space Plasmas, Helium Ions, Hydrogen Ions, Magnetospheric Instability, Oxygen Ions, Positive Ions

Scientific paper

One of the potentially most useful aspects of mass spectroscopy in magnetospheric research is related to the ability to distinguish between ions of solar wind and terrestrial origins. Knowing the source of the plasmas in various regions and under various geomagnetic conditions is crucial in improving the understanding of particle flows in the magnetosphere. Sharp et al. (1982) found that the plasma sheet ions in the 0.1- to 16-keV/e range, were predominantly of solar wind origin during low geomagnetic activity, while there was a large terrestrial component during active times. This paper presents a set of data from March 22, 1979. The reported investigation represents the first detailed case study of the relation between geomagnetic substorm activity and the ion composition in the plasma sheet. A decrease in solar wind ion flow at ISEE 1 and the subsequent increase in the flow of ionospheric ions is interpreted as evidence of a fundamental change in the particle flow pattern following the start of substorm activity.

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