The generation of vertical thermospheric winds and gravity waves at auroral latitudes. I - Observations of vertical winds

Details The generation of vertical thermospheric winds and gravity waves at auroral latitudes. I - Observations of vertical winds The generation of vertical thermospheric winds and gravity waves at auroral latitudes. I - Observations of vertical winds

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..667r&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, June 1984, p. 667-684. Research supported by the Science and Engineering

Physics

76

Auroral Zones, Gravity Waves, Thermosphere, Vertical Motion, Winds Aloft, Arctic Regions, Fabry-Perot Interferometers, Time Response

Scientific paper

Vertical winds of tens of meters/sec or more are a ubiquitous feature of the upper thermosphere's wind field in those polar regions that are under the direct influence of magnetospheric energy and momentum sources. In periods of moderate geomagnetic activity, there are regions of systematic vertical winds which exhibit a diurnal variation. Such winds, and large systematic downward winds at times of large disturbances on the poleward boundary of the afternoon auroral oval, appear to be associated with downward divergences or upward convergences of the ion drag-induced horizontal winds acting in addition to the variety of high latitudinal heat sources. Much stronger upward winds which are observed in association with the expansion phase of geomagnetic disturbances are strongly timeand space-dependent and have to be placed in the context of very large disturbances of the horizontal wind field.

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