Near-equatorial, high-resolution measurements of electron precipitation at L approximately equal to 6.6

Details Near-equatorial, high-resolution measurements of electron precipitation at L approximately equal to 6.6 Near-equatorial, high-resolution measurements of electron precipitation at L approximately equal to 6.6

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.2295b&link_type=abstract

Journal of Geophysical Research, vol. 86, Apr. 1, 1981, p. 2295-2313. Research sponsored by the U.S. Department of Energy.

Physics

39

Auroral Zones, Electron Precipitation, Equatorial Atmosphere, High Energy Electrons, Magnetic Storms, Precipitation Particle Measurement, Energetic Particles, Energy Spectra, High Resolution, Polar Regions, Statistical Correlation

Scientific paper

Correlated measurements of auroral zone riometer data and high resolution, greater than 30 keV electron measurements made at geostationary orbit during the course of magnetospheric substorms are presented. Before the onset of substorm expansion, substantial evidence is found to support the concept of a substorm growth phase. After the expansion phase onset and the concomitant injection of newly energized electrons into the outer magnetosphere, it is possible to examine equatorial electron fluxes in the loss cone for cases of weak pitch angle diffusion as well as for cases of strong pitch angle diffusion. It is found that, during strong diffusion events, precipitating electron fluxes are highly fluctuating and impulsive at the minimum loss cone sampling time of 10 sec. In the case of such event periods the pitch angle distribution outside the loss cone is nearly flat, the absolute electron intensity is near 'saturation,' and the 20-MHz conjugate riometer intensity is very high.

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