Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6517d&link_type=abstract
Journal of Geophysical Research, vol. 84, Nov. 1, 1979, p. 6517-6523. Research supported by the Lockheed Independent Research P
Physics
6
Auroras, Earth Magnetosphere, Electron Capture, Geomagnetic Pulsations, Very Low Frequencies, Wave Interaction, Electron Scattering, Magnetohydrodynamic Flow, Particle Flux Density, Particle Interactions, Sine Waves, Unsteady Flow, Wave Generation
Scientific paper
A model is developed for self-modulated pulsations in the outer trapped electron belts. The pulsations are a consequence of growth of VLF waves and removal of trapped electrons following an electron injection event. If too many electrons are removed by wave interactions, the system restores itself by building up the flux again to values exceeding the equilibrium flux, repeated through many cycles. Pulsations are shown to be possible for both broadband VLF wave generation and narrowband wave generation. The resulting electron precipitation pulses are consistent with observations of pulsating aurorae on the morningside following a substorm injection event. The conditions for pulsations are quite stringent and favor trapped particle fluxes near the stable trapping limit. Individual pulses may be in or near strong diffusion.
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