Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510313h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10313-10320.
Physics
38
Equatorial Atmosphere, Helium Ions, Ionospheric Composition, Spatial Distribution, Upper Ionosphere, Vertical Distribution, Hydrogen, Ion Concentration, Northern Hemisphere, Oxygen Ions, Solar Maximum Mission
Scientific paper
The properties of the plasma composition in the topside ionosphere between 15 and 35 deg magnetic latitude are examined. Calculations are used to show that the distribution of neutral species at solar maximum, together with the appropriate ionization rates, can readily account for the dominance of He(+) at midlatitudes. The relative abundance of the atmospheric species is a sensitive function of local time and the associated evolution of the topside O(+) concentration profile. The existence of an ExB drift motion of the plasma is needed to explain the He(+) minimum at the dip equator. While the He(+) concentration there is produced in one day against the chemical loss process, at midlatitudes a large flux tube volume provides a reservoir in which the He(+) can accumulate each day.
Bailey Graham J.
Hanson William B.
Heelis Roderick A.
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