Temperatures and meridional winds in the vicinity of the SAR-arc as observed from Albany, New York

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Atmospheric Circulation, Atmospheric Temperature, Meridional Flow, Red Arcs, Fabry-Perot Interferometers, Magnetic Disturbances, New York, Photometry

Scientific paper

Observations obtained with a scanning photometer and a Fabry-Perot interferometer at a station near Albany, NY are used to determine thermospheric wind patterns and temperatures for two nights with geomagnetic disturbances: March 6, 1981, when a 2.2-kR stable auroral red (SAR) arc was measured but no visible aurora was observed, and May 9, 1981, when there were dramatic AE changes, a 700-R SAR arc, and an intense visible aurora. The data are presented in graphs and compared with the corresponding magnetic-field measurements. Large temperature gradients between the SAR arc and the regions immediately north and south of the arc are noted, with meridional winds blowing away from the arc (in both directions equally on March 6, but more strongly to the north on May 9). The results are characterized in terms of the dynamic response of the thermosphere to neutral-gas heating processes in the SAR arc and aurora.

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