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Seasonal and solar cycle variations in high-latitude thermospheric winds

Aruliah, AL; Rees, D; Steen, A; (1991) Seasonal and solar cycle variations in high-latitude thermospheric winds. Geophysical Research Letters , 18 (11) 1983 - 1986. 10.1029/91GL02240. Green open access

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Thermospheric wind measurements have been collected systematically every winter for over nine years from a high-latitude site at Kiruna, Sweden (67.8-degrees-N, 20.4-degrees-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 behaviour of high-latitude thermospheric winds at spring and autumn equinox has not yet been predicted by model simulations.

Type: Article
Title: Seasonal and solar cycle variations in high-latitude thermospheric winds
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/91GL02240
Publisher version: http://dx.doi.org/10.1029/91GL02240
Language: English
Additional information: Copyright 1991 by the American Geophysical Union
Keywords: Model, Circulation
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/144956
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