Fine-scale spatial structure in the pitch angle distributions of energetic particles near the midnight trapping boundary

Details Fine-scale spatial structure in the pitch angle distributions of energetic particles near the midnight trapping boundary Fine-scale spatial structure in the pitch angle distributions of energetic particles near the midnight trapping boundary

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5215i&link_type=abstract

Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5215-5221.

Physics

3

Angular Distribution, Electron Precipitation, Magnetically Trapped Particles, Night Sky, Particle Energy, Proton Precipitation, Atmospheric Stratification, Electron Flux Density, Energy Spectra, High Energy Electrons, Magnetic Rigidity, Pitch (Inclination), Proton Flux Density, Radiation Distribution, Spatial Distribution

Scientific paper

Near the trapping boundary at local midnight the ratio of precipitating to trapped fluxes of electrons and of protons observed at low satellite altitudes depends mainly on the particle energy and L value. On a given L shell, particles above a given energy are often characterized by isotropy, while below that energy the precipitating fluxes are much lower than the trapped fluxes. The onset of isotropy typically occurs at a sharply defined energy threshold which decreases rapidly with increasing L value. When considered in terms of magnetic rigidity, the occurrences of isotropy for electrons and protons together show a consistent variation with L. The observed magnetic rigidity thresholds for isotropy may provide a measure of the effective scale length of the inhomogeneities of the geomagnetic field.

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