Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.5885l&link_type=abstract
Journal of Geophysical Research, vol. 86, July 1, 1981, p. 5885-5888.
Physics
12
Charge Exchange, Geosynchronous Orbits, Ionospheric Ion Density, Radiation Belts, Ion Injection, Pitch (Inclination)
Scientific paper
Trapped ions believed to have been injected directly into the radiation belts from the ionosphere are persistently observed near synchronous orbit. However, there is apparent inconsistency between the composition of the trapped ions observed near synchronous orbit and that observed at lower altitudes of ions flowing upward from the ionosphere. The upflowing ionospheric ions are dominated by H(+), with a significant but lesser amount of O(+), while the small pitch angle ions near synchronous orbit are dominated by O(+). In this paper, it is shown that ion loss from charge exchange with neutral hydrogen is a plausible cause of the differing composition at low and high altitudes. In addition, it is found that such charge exchange can simultaneously account for minima near 0 and 180 deg and maxima near 15-20 deg and 160-165 deg observed in the pitch angle distributions of the trapped ions.
Lyons Larry R.
Moore Thomas Earle
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