Polar cap electron acceleration regions

Details Polar cap electron acceleration regions Polar cap electron acceleration regions

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5863b&link_type=abstract

Journal of Geophysical Research, vol. 84, Oct. 1, 1979, p. 5863-5874.

Physics

7

Electric Fields, Electron Accelerators, Electron Energy, Interplanetary Magnetic Fields, Polar Caps, Data Reduction, Earth Magnetosphere, Electrostatics, Polar Regions, Satellite Observation

Scientific paper

The characteristics of polar cap electron acceleration regions and the relationship of their occurrence to the interplanetary magnetic field (IMF) have been investigated by using data from Atmosphere Explorer D and Imp J. It was found that electron energy spectra and angular distributions within the acceleration regions are generally consistent with models of acceleration of auroral primaries and reflection of atmospheric secondaries by field-aligned electrostatic potential differences. However, localized strongly field-aligned fluxes are also observed at energies below the spectral peak. It is suggested that these transient beams of field-aligned low-energy electrons result from the acceleration of thermal electrons from within the acceleration regions and that this thermal electron population may be partially replenished by small pitch angle atmospheric secondaries. The occurrence of the polar cap acceleration regions in the northern hemisphere is strongly correlated with IMF vectors which project into the (-X, +Z) sector of the solar magnetospheric X-Z plane; that is, with northward 'away' IMF polarities.

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