The charge-state composition of 0.4-MeV helium ions in Earth's outer radiation belts during quiet times

Details The charge-state composition of 0.4-MeV helium ions in Earth's outer radiation belts during quiet times The charge-state composition of 0.4-MeV helium ions in Earth's outer radiation belts during quiet times

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984cscm.rept.....c&link_type=abstract

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Physics

Charge Distribution, Earth Magnetosphere, Geosynchronous Orbits, Helium Ions, Radiation Belts, Earth Atmosphere, Ion Density (Concentration), Planetary Radiation, Trapped Particles, Upper Atmosphere

Scientific paper

The charge state of 0.40 to 0.55 MeV helilum ions in Earth's outer magnetosphere (L approx. 6) were measured by a novel technique. The radial gradient of the helium ion flux and the east-west anisotropy in the pitch-angle distribution are both measured. These are combined with measurements of the magnetic field to calculate the flux-weighted average ion gyroradius. Since the magnitude of the magnetic field and the energies of the ions are known, the gyroradius determines the ion's charge state. During two pairs of geomagnetically quiet days in 1979 it was found that most of these ions are singly charged which is in accord with theoretical calculations which found that charge-exchange reactions between these ions and the neutral hydrogen geocorona ar ethe dominant factors in controlling the charge state of these ions at times longer than a day after their injection. It is also suggested that the mean charge state of the helium ions may vary with position in the magnetosphere and with time.

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