Field-aligned suprathermal electron fluxes below 270 km in the auroral zone

Details Field-aligned suprathermal electron fluxes below 270 km in the auroral zone Field-aligned suprathermal electron fluxes below 270 km in the auroral zone

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25....5r&link_type=abstract

Planetary and Space Science, vol. 25, Jan. 1977, p. 5-13. Research supported by the Science Research Council.

Physics

2

Auroral Zones, Electron Flux Density, High Energy Electrons, Lines Of Force, Atmospheric Electricity, Electrostatic Probes, Rocket-Borne Instruments

Scientific paper

By means of a hemispherical electrostatic analyzer flown aboard rockets into two auroral events, short duration bursts of enhanced suprathermal electrons were detected on several occasions when the electron flux in the energy range 50-500 eV showed a high degree of field alignment. An acceleration mechanism acting parallel to the geomagnetic field is needed to account for the field alignment. Monte Carlo calculations for the scattering of electrons by model atmospheres with exospheric temperatures of 750 and 1500 K indicated that the event at 267 km result could be explained in terms of a local parallel electric field of 1-2 mV/m. A much higher electric field, about 10 mV/m, is necessary to account for the event at 210 km.

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