Radar auroral substorm signatures. I - Expansive and recovery phases

Physics

Scientific paper

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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.

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