The electron pitch angle distribution at geosynchronous orbit associated with absorption spikes during the substorm expansion phase

Details The electron pitch angle distribution at geosynchronous orbit associated with absorption spikes during the substorm expansion phase The electron pitch angle distribution at geosynchronous orbit associated with absorption spikes during the substorm expansion phase

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..887n&link_type=abstract

Journal of Geophysical Research, vol. 87, Feb. 1, 1982, p. 887-894. Research supported by the Max-Planck-Gesellschaft zur Foerd

Physics

15

Atmospheric Attenuation, Electron Distribution, Geosynchronous Orbits, Magnetic Storms, Magnetospheric Electron Density, Pitch (Inclination), Auroral Zones, Energy Spectra, Geomagnetism, Geos 2 Satellite, Magnetospheric Ion Density, Polar Substorms, Temporal Distribution

Scientific paper

Magnetospheric electron (16-300 keV) and ion (27-400 keV) fluxes associated with auroral absorption events named 'absorption spikes' are investigated. The particle flux observations, along with magnetic field measurements, were made on board the geosynchronous satellite GEOS 2. Data from three consecutive substorm activations are analyzed. The events were associated with strong variations in the electron fluxes but only weak variations in the ion fluxes. Strong indications are found that the electron pitch angle distributions associated with the absorption spike were characterized by maxima near 0 deg, 180 deg, and 90 deg and dominated by a strong field-aligned bidirectional anisotropy at energies below 100 keV. At lower magnetic latitudes, the field-aligned anisotropy is decreased in both magnitude and the flux maximum at 90 deg pitch angle.

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