Vertical winds in the central polar cap

Details Vertical winds in the central polar cap Vertical winds in the central polar cap

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30nssc2g&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 14, pp. SSC 2-1, CiteID 1725, DOI 10.1029/2003GL017124

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Meteorology And Atmospheric Dynamics: Thermospheric Dynamics (0358), Ionosphere: Polar Cap Ionosphere, Atmospheric Composition And Structure: Airglow And Aurora

Scientific paper

Upward vertical winds are observed in the polar cap F-region over Eureka (80°N) during and following sustained polar auroras. This suggests that heating due to particle energy deposition in the F-region is sufficient to generate upward flow. At such times there is a positive divergence in the horizontal winds, indicating that the upward flow is also outward over a >1000 km diameter across the central polar cap. The vertical winds, averaged over a 5-winter period, also have a positive correlation with the horizontal divergences indicating the flow is generally large scale. Downward winds are seen to similarly correspond with negative divergences, and negative IMF Bz, suggesting they may be linked with activity at auroral latitudes. Vertical winds observed over Eureka at other times, appear to be oscillatory with 12-hr and higher harmonic periods suggesting tidal activity. This preliminary conclusion will be tested by examining further winds and aeronomic data.

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