Electron precipitation observations from a rocket flight through the dayside auroral oval |
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| Authors: | D J McEwen |
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| Institution: | Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada |
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| Abstract: | Energy spectra of electrons between 30 eV and 18 keV were obtained with a spectrometer on a Black Brant rocket launched from Cape Parry, N.W.T. (Λ = 75.2°) on December 6, 1974 to study the dayside magnetospheric cleft. The rocket flew to an apogee of 236 km and travelled poleward to 80° invariant latitude. The cleft was observed to extend from 76.9 to 78.4° invariant latitude. Equatorward of this electrons of a few keV energy were observed with a total energy flux of up to 2 erg/cm2 sec ster. Variable fluxes of electrons with a spectrum fitted by a Maxwellian distribution of 150 eV characteristic energy were observed through most of the cleft. One inverted V structure was crossed. In that region, the electron energy increased to 650 eV and a total energy flux of 8 erg/cm2 sec ster was measured. The event was a temporal one and only a few km in width, as deduced from optical data. Fluxes of about 10?2 erg/cm2 sec ster were recorded poleward of the cleft. |
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