Impulsive Joule heating of the auroral thermosphere as a source of generation of large-scale gravity waves

Details Impulsive Joule heating of the auroral thermosphere as a source of generation of large-scale gravity waves Impulsive Joule heating of the auroral thermosphere as a source of generation of large-scale gravity waves

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ge%26ae..49..227i&link_type=abstract

Geomagnetism and Aeronomy, Volume 49, Issue 2, pp.227-231

Computer Science

2

94.20.Ac, 92.60.Hb, 92.60.Hh

Scientific paper

The Doppler temperature of the [OI] 557.7 nm emission in diffused auroras were measured in the Tixie Bay (ϕ = 65.6° N, λ = 196.9° E) from 1973 to 1976 with the help of a Fabry-Pérot scanning interferometer. Abrupt increases in temperature of the auroral thermosphere during 1.5-3.0 h, independent of a change in the altitude of the atmospheric emitting region, were repeatedly detected during these experiments. Such cases were also observed during the simultaneous temperature measurements over the northern and southern horizons at zenith angles of z = 60° N and 30° S. An impulsive increase in the temperature above the northern horizon was observed several tens of minutes before such a increase above the southern horizon. This experimental fact indicated that the source of this phenomenon was located north of the observation point, possibly in the auroral oval region. An analysis of the data indicated that impulsive Joule heating of the polar thermosphere, which was accompanied by the generation of the large-scale gravity wave packet that propagated to midlatitudes, was the most probable such source.

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