Physics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.9743i&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 9743-9752.
Physics
28
Energetic Particles, Geomagnetism, Magnetically Trapped Particles, Radiation Belts, Electron Precipitation, Magnetic Field Configurations, Proton Precipitation
Scientific paper
The fluxes of trapped and precipitating particles are often nearly equal at the trapping boundary in the radiation belts at low satellite altitudes. Here, details are presented on the strong dependence of the measured ratios of precipitating to trapped electrons on the gyroradius of the particles. Published theoretical calculations for the L dependences of the magnetic rigidity of the onset of isotropy for both electrons and protons near midnight are compared with the present measurements under both very quiet and very disturbed magnetic activity conditions. The measured curves are generlly steeper than the theoretical ones except for a few at very disturbed times when reasonable agreement is achieved. The frequency of occurrence of an energy selective threshold for isotropy at the trapping boundary is presented as a function of magnetic local time; it was observed on 34 percent of the passes near midnight and seldom near noon.
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