Electron pitch-angle distributions in an inverted 'V' structure

Details Electron pitch-angle distributions in an inverted 'V' structure Electron pitch-angle distributions in an inverted 'V' structure

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..149m&link_type=abstract

Geophysical Research Letters, vol. 3, Mar. 1976, p. 149-152.

Physics

3

Angular Distribution, Auroral Zones, Electron Density (Concentration), Particle Acceleration, Pitch (Inclination), Auroral Arcs, Electric Fields, Electron Energy, Electron Precipitation, Magnetic Storms, Satellite Observation

Scientific paper

The pitch-angle distributions of the auroral electrons responsible for an inverted 'V' structure encountered by a low-altitude polar satellite are examined in the context of an electric-field acceleration. The inverted 'V' structure considered was encountered at the lower latitude edge of a discrete auroral arc system during a well-developed substorm a few hours before local midnight. Plots of differential energy-flux spectra at five latitudes are presented along with plots of pitch-angle distributions at selected energies of the electron number flux in the observed inverted 'V' structure. It is shown that the precipitated-electron spectral peak shifted from low energy to high energy and then back to low energy as the satellite encountered the inverted 'V'; the reflected spectrum remained essentially the same as the precipitated spectrum up to the peak energy as the peak energy increased. It is concluded that electric-field acceleration on closed field lines is the most plausible explanation of these observations.

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