Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..660o&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, June 1987, p. 660-663.
Physics
14
Auroral Spectroscopy, Auroral Zones, Electron Precipitation, Proton Precipitation, Satellite Observation, Atmospheric Radiation, H Beta Line, Oxygen Spectra
Scientific paper
The contribution of precipitating protons to the formation of the duskside auroral oval is examined. Auroral images at wavelengths of 5577 A (O I) and 4861 A (H-beta) are compared with auroral particle data obtained by the DMSP F6 and F7 satellites. On the basis of the particle data, a proton-dominant region in which the input energy carried by protons exceeded that of electrons is found. The proton-dominant region is located at the equatorward edge of the duskside auroral oval. A direct comparison of data from auroral photoemissions and auroral particle precipitations reveals that the region of diffuse 5577 A and 4861 A auroras equatorward of the quiet discrete arcs coincides with the proton-dominant region. Furthermore, a spotlike structure of the proton aurora drifting westward at a speed of 0.4 km/sec is found.
Hirasawa Takeo
Meng Ching I.
Ono Takayuki
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