New light on the equatorial source of pulsating aurora

Details New light on the equatorial source of pulsating aurora New light on the equatorial source of pulsating aurora

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.298..253g&link_type=abstract

Nature, vol. 298, July 15, 1982, p. 253-255. Research supported by the Max-Planck-Gessellschaft zur Foerderung der Wissenschafte

Physics

4

Auroras, Electron Precipitation, Equatorial Atmosphere, Extremely Low Frequencies, High Energy Electrons, Hiss, Cyclotron Radiation, Electron Scattering, Electrostatic Waves, Geos Satellites (Esa), Harmonic Radiation

Scientific paper

Data from the ESA GEOS 1 and 2 spacecraft were employed to study the 2-20 sec ELF hiss detected in the equatorial diffusion region, where 2-40 keV electrons precipitate at altitudes above 80 km during auroral substorms. The satellites recorded the ELF hiss after auroral substorms, and correlations were made with variations in the geomagnetic activity index. Considering only higher energy precipitating electrons, as measured by an electron spectrometer with 10-direction sensitivity, data from a 14 min period on Nov. 19, 1979 was examined. Auroral pulsations were occurring, along with ELF hiss, electrostatic VLF waves and a constant geomagnetic field direction. A relationship was established between the pulsating ELF hiss and precipitating electrons with energies exceeding 22 keV.

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