Seasonal and solar cycle variations in high-latitude thermospheric winds

Details Seasonal and solar cycle variations in high-latitude thermospheric winds Seasonal and solar cycle variations in high-latitude thermospheric winds

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1983a&link_type=abstract

Geophysical Research Letters, Volume 18, Issue 11, p. 1983-1986

Physics

15

Meteorology And Atmospheric Dynamics: Thermospheric Dynamics, Ionosphere: Ionosphere/Atmosphere Interactions, Ionosphere: Auroral Ionosphere, Ionosphere: Polar Cap Ionosphere

Scientific paper

Thermospheric wind measurements have been collected systematically every winter for over nine years from a high-latitude site at Kiruna, Sweden (67.8°N, 20.4°E). The database contains 1242 nights of data collected with a Fabry-Perot Interferometer (FPI), perhaps the largest single- site database of thermospheric winds. This analysis shows a marked seasonal and solar cycle variation. Particularly at high solar activity, sunward winds of the evening period (16-20 UT) are more than 50% stronger at Spring than at Autumn equinox. This large asymmetry in the behavior of high-latitude thermospheric winds at spring and autumn equinox has not yet been predicted by model simulations.

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