Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.6148t&link_type=abstract
Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 6148-6168.
Physics
Auroral Echoes, Geomagnetism, Polar Substorms, Radar Signatures, Radio Auroras, Alaska, Diurnal Variations, Ionospheric Disturbances, Magnetic Storms, Phased Arrays, Radar Scattering, Signature Analysis
Scientific paper
Selected radar auroral substorm signatures as seen with the Homer 398-MHz phased array radar are described. The more easily identified radar substorm signatures have been categorized and related to the auroral and magnetic conditions that prevailed during the corresponding phase of a substorm. The selected categories are (1) bifurcation of diffuse auroral echoes, (2) poleward and equatorward movements, and (3) the sudden appearance of discrete auroral echoes. The second part of the paper deals with east-west motions identified in the radar signatures, namely the westward travelling surge in the premidnight sector and eastward motions in the morning sector. An analysis of visual, geomagnetic, and Chatanika radar data has made it clear that a hooklike radar signature is associated with the visual westward travelling surge.
Fremouw Edward J.
Tsunoda Roland T.
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