Intense electron and proton fluxes poleward of the trapping boundary during a substorm expansion

Details Intense electron and proton fluxes poleward of the trapping boundary during a substorm expansion Intense electron and proton fluxes poleward of the trapping boundary during a substorm expansion

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2854r&link_type=abstract

Journal of Geophysical Research, vol. 82, July 1, 1977, p. 2854-2858. Research sponsored by the Bundesministerium für Forschung

Physics

Electron Flux Density, Polar Substorms, Proton Flux Density, Trapped Particles, Auroral Zones, Injun Satellites, Satellite Observation

Scientific paper

The paper presents particle observations from two-polar-orbiting satellites, supplemented by observations of cosmic noise absorption and magnetic activity on ground during the maximum magnetic activity of an intense substorm on November 11, 1969. The first satellite to cross the evening auroral zone recorded a narrow 40-keV electron spike at about 69 deg, only .5 deg poleward of the trapping boundary for 100-keV electrons; 3 min later the second satellite encountered intense fluxes of 40-keV electrons, relativistic electrons and energetic protons poleward of the previously observed trapping boundary. The most intense fluxes occurred in the vicinity of the Harang discontinuity. These observations apparently show poleward expansion of substorm activity; this is also indicated by the ground-based observations. The observations are consistent with a stochastic acceleration mechanism for both electrons and protons.

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