Coordinated observations of electron energy spectra and electrostatic cyclotron waves during diffuse auroras

Details Coordinated observations of electron energy spectra and electrostatic cyclotron waves during diffuse auroras Coordinated observations of electron energy spectra and electrostatic cyclotron waves during diffuse auroras

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4..405f&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences, vol. 4, Oct. 1986, p. 405-412.

Physics

2

Auroras, Cyclotron Radiation, Electron Precipitation, Electrostatic Waves, Energy Spectra, Space Plasmas, Diffuse Radiation, Eiscat Radar System (Europe), Electron Density Profiles, Electron Energy, Geos 2 Satellite

Scientific paper

An auroral precipitation event lasting several hours in the dusk sector on June 2, 1982 is studied in conjunction with three instruments: the EISCAT European Incoherent Scatter radar based in Scandinavia, the GEOS-2 European geostationary spacecraft, and the ARCAD-3 French-Soviet polar spacecraft. Electron energy spectra between about 1 and 10 keV, computed from EISCAT measurements, were in agreement, during a diffuse aurora period, with direct observations onboard ARCAD-3, and also with the plasma sheet component (3-10 keV) measured onboard GEOS-2 and available at large pitch-angles. This last comparison suggested the quasi-isotropy of equatorial electron fluxes. The electrostatic electron cyclotron harmonic waves, also observed onboard GEOS-2, were not found to be intense enough to cause by themselves the strong pitch-angle diffusion of electrons of a few keV.

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