Physics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5039h&link_type=abstract
Journal of Geophysical Research, vol. 81, Oct. 1, 1976, p. 5039-5042. Research supported by the Bundesministerium für Forschung
Physics
13
Hydrogen, Interplanetary Space, Neutral Particles, Outer Radiation Belt, Trapped Particles, Energy Spectra, Esro 4 Satellite, Molecular Collisions, Particle Flux Density, Proton Energy, Satellite Observation
Scientific paper
Trapped protons in the outer radiation belt of earth can be removed through charge exchange by collisions with neutral exospheric hydrogen. The neutralized energetic particles escape into interplanetary space as well as to low altitudes. At low altitudes, these particles constitute a copy of the outer radiation belt and have been repeatedly observed. It is proposed that the energetic neutral hydrogen escaping into interplanetary space is responsible for the recently observed highly anisotropic hydrogen flux at energies of 0.29 to 0.5 MeV during quiet solar times. The expected energy spectrum of the neutral hydrogen flux in interplanetary space is derived from low-altitude measurements obtained on board the Esro 4 satellite and is compared with observations. The result supports the hypothesis.
Hovestadt Dieter
Scholer Manfred
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