The outer boundary of the Earth's electron radiation belt - Dependence upon L, energy, and equatorial pitch angle

Details The outer boundary of the Earth's electron radiation belt - Dependence upon L, energy, and equatorial pitch angle The outer boundary of the Earth's electron radiation belt - Dependence upon L, energy, and equatorial pitch angle

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5925i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5925-5934.

Physics

2

Angular Resolution, Electron Radiation, Pitch (Inclination), Radiation Belts, Satellite Observation, Terrestrial Radiation, Chemical Release Modules, Scatha Satellite

Scientific paper

An investigation has been made of the location of the nightside outer boundary of the Earth's electron radiation belt and its dependence upon energy and mirror point altitude. The energy versus L dependence of the position of the trapping boundary is important for comparisons with models of the mechanisms to explain the loss of trapping at the outer edge of the radiation belt. Satellites often passed through the trapping boundary slowly, obtaining fine-scale measurements. With fine spatial resolution the cutoff L values were often found to be almost independent of energy for E below 300 keV, and were nearly independent of equatorial pitch angle up to 30 deg. In the radiation belt near the outer edge sometimes the flux dropped to only intermediate values or background level for short times (or equivalently narrow L intervals), suggesting time variations or the irregular onset of the mechanism(s) responsible for the trapping boundary.

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