Intense electron and proton fluxes poleward of the trapping boundary during a substorm expansion
| Autor: | E. Kirsch, Manfred Scholer, L. Rossberg |
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| Rok vydání: | 1977 |
| Předmět: |
Atmospheric Science
Proton Astrophysics::High Energy Astrophysical Phenomena Soil Science Trapping Electron Aquatic Science Oceanography Geochemistry and Petrology Substorm Earth and Planetary Sciences (miscellaneous) Absorption (electromagnetic radiation) Cosmic noise Earth-Surface Processes Water Science and Technology Physics Ecology Paleontology Forestry Computational physics Baryon Geophysics Space and Planetary Science Physics::Space Physics Atomic physics Lepton |
| Zdroj: | Journal of Geophysical Research. 82:2854-2858 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/ja082i019p02854 |
| Popis: | We present particle observations by 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 observes a narrow 40-keV electron spike at ∼69° only ½° poleward of the trapping boundary for 100-keV electrons; 3 min later the second satellite encounters intense fluxes of 40-keV electrons and also of relativistic electrons and energetic protons poleward of the previously observed trapping boundary. The most intense fluxes occur in the vicinity of the Harang discontinuity. It appears that the two satellites provide snapshots of a poleward expansion of substorm activity, as this is also indicated by the ground-based observations. Our observations are consistent with a stochastic acceleration mechanism for both electrons and protons. |
| Databáze: | OpenAIRE |
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