The origins of the plasma in the distant plasma sheet

Details The origins of the plasma in the distant plasma sheet The origins of the plasma in the distant plasma sheet

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8710420s&link_type=abstract

Journal of Geophysical Research, vol. 87, Dec. 1, 1982, p. 10420-10424.

Physics

55

Atmospheric Composition, Plasma Layers, Positive Ions, Satellite Observation, Space Plasmas, Helium Ions, Hydrogen Ions, Magnetospheric Ion Density, Mass Spectroscopy, Oxygen Ions

Scientific paper

It is pointed out that ion mass spectrometers operating in the keV range have recently begun to provide a new class of information on magnetospheric processes. One of the principal motivations for the development of energetic ion mass spectrometers has been to investigate the origins of the hot plasma populations of the magnetosphere. Peterson et al. (1981) were able to estimate the fractional ion density of ionospheric origin in five intervals by intercomparing the He(++) and H(+) spectra and assuming the excess low-energy H(+) ions were from the ionosphere. They obtained values in the range from 0.1 to 0.65. The present investigation is concerned with an expansion of the previous study. A substantially larger data base is utilized, and a different set of assumptions is considered to infer the relative fractions of solar and ionospheric H(+) and to look for systematic changes in the relative source strengths with magnetic activity.

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