Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976kosis..14...53k&link_type=abstract
Kosmicheskie Issledovaniia, vol. 14, Jan.-Feb. 1976, p. 53-60. In Russian.
Physics
Auroral Spectroscopy, H Alpha Line, Polar Substorms, Proton Precipitation, Cosmos Satellites, Geomagnetic Tail, Magnetic Storms, Nocturnal Variations
Scientific paper
Characteristics of precipitating protons in the near-midnight sector of local magnetic time in the auroral zone are examined on the basis of measurements made by the satellite Cosmos 348. Analysis of the results shows that the maximum of proton precipitation during magnetically quiet times is observed with an almost isotropic pitch-angle distribution near the equatorial boundary of the mean H-alpha airglow zone. It is found that during the substorm on June 26, 1970, the precipitation zone was divided into two regions: (1) a high-latitude region, where longitudinal fluxes of low-energy protons were observed, and (2) a low-latitude region, where fluxes of protons with energies of 4 to 8 keV and an isotropic pitch-angle distribution were detected. These findings are interpreted in terms of plasma convection under the action of the electric field in the magnetotail and the formation of a neutral line with an X-point at the time of the substorm.
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