Seasonal and solar cycle wind variations, 80-100 km

Details Seasonal and solar cycle wind variations, 80-100 km Seasonal and solar cycle wind variations, 80-100 km

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..707d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, Oct. 1983, p. 707-718.

Physics

22

Annual Variations, Mesosphere, Solar Cycles, Solar Terrestrial Interactions, Wind Variations, Atmospheric Models, Meridional Flow

Scientific paper

In an effort to improve the observational model of winds in the 801-100-km region, an attempt has been made to gather all available sets of experimental ground-based remote measurements of high altitude wind. The collected data span nearly 30 yr and are analysed in terms of seasonal and long-term solar cycle behavior. Some of the primary results are: (1) hemispheric asymmetries occur in the annual average and 12-month harmonics of zonal and meridional wind, and these results could be used to improve the CIRA-72 wind model near 90 km; (2) the annual and semiannual harmonics contribute substantially to the variance of wind components between 45 and 65 deg N; for the 12-month component in zonal wind, phase (date of maximum westerlies) changes from winter at 80 km to summer at 100 km; for the 12-month component in meridional wind, phase (date of maximum southerlies) at 90 km is near December in both hemispheres; for the 6-month component in zonal wind, phase changes from near the equinoxes at 80 km to near the solstices at 90 and 100 km; for the 6-month component in meridional wind, phase at 90 km is equinoctal; (3) the occurrence of stronger westerlies at 90 km during winter in solar maximum than in solar minimum years first described by Sprenger and Schminder (1969) is confirmed with independent data at 50 deg N and 35 deg S; in addition, it appears that zonal winds are more easterly and meridional winds more southerly in spring and early summer in solar maximum years than in solar minimum years in the Northern Hemisphere.

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