Diffusive equilibrium distributions of He(+) in the plasmasphere

Details Diffusive equilibrium distributions of He(+) in the plasmasphere Diffusive equilibrium distributions of He(+) in the plasmasphere

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..611w&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, May 1984, p. 611-618.

Computer Science

Sound

9

Helium Ions, Ionospheric Ion Density, Plasmasphere, Positive Ions, Equatorial Atmosphere, International Sun Earth Explorer 1, Oxygen Ions, Satellite Sounding, Steady State

Scientific paper

Recent satellite observations of thermal ion composition in the near-equatorial plasmasphere have shown that He(+) comprises 5-10 percent typically and occasionally 25 percent or more of the total thermal ion density. A steady state diffusive equillibrium model for the distributions of H(+), He(+) and O(+) along a plasmaspheric flux tube is used to elicit effects that may help explain these observed high He(+) fractional concentrations. The model indicates that both the ionospheric composition and the temperature distribution along the flux tubes are important factors controlling the equatorial He(+) composition, through the phlasma scale height and thermal diffusion effects. Direct comparison of the model results with thermal ion observations by ISEE-1 indicates that the effects incorporated into the model may explain some of the elevated He(+) concentrations. In some instances, however, effects not included in the model may be of importance.

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