Physics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44...71s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, Jan. 1982, p. 71-73, 75-79. Research supported by the Great Norwegian-
Physics
5
Auroral Spectroscopy, F Region, Night Sky, Atmospheric Circulation, Atmospheric Temperature, Emission Spectra, Fabry-Perot Interferometers, Height, Line Spectra, Magnetic Effects, Magnetic Storms, Oxygen Atoms
Scientific paper
Coordinated optical observations were performed from the poleward side of the midnight auroral oval. Height measurements of the auroral emissions at 4278,5577 and 6300 A, as well as their intensity ratios in the poleward expanded auroral substorm, have been carried out. The findings indicate a significantly softened electron spectrum compared with similar data from the equatorward part of this substorm. Typical values for the poleward expanded aurora are 300 eV and lower, while keV particles dominate the auroras at 10-deg lower latitudes. Emission altitudes and spectral characteristics are comparable to the transient burst emissions frequently observed from the same site in the post-noon sector, i.e. within the cusp. The 6300 A atomic oxygen emission is used as a tracer of F-region wind and temperature. Interferometer observations show that there exists a prevailing crosspolar antisunward wind, increasing with geomagnetic activity to several hundred m/s. The temperature shows an increase of 150 K associated with high geomagnetic activity.
Egeland A. A.
Henriksen Kim
Sandholt Per Even
Smith Rachel
Sweeney P.
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