Springtime transitions in mesopause airglow and dynamics: photometer and MF radar observations in the Scandinavian and Canadian sectors

Details Springtime transitions in mesopause airglow and dynamics: photometer and MF radar observations in the Scandinavian and Canadian sectors Springtime transitions in mesopause airglow and dynamics: photometer and MF radar observations in the Scandinavian and Canadian sectors

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1131m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 8-11, p. 1131-1146.

Physics

6

Scientific paper

Observations from 2 optical ground stations and 3 MF radars at high and mid-latitudes have been combined to describe ``springtime transitions'' in atomic oxygen and the mesopause wind fields and waves for eight years (1991-1998). The typical signature in the Stockholm (60°N,20°E)OI558nm `green-line' emission involves a rapid (circa) 2-days rise in the nighttime value by factors of 2 or so, with a subsequent decrease by factors of 3-10. There is considerable inter-annual variability in these green-line emissions, and also the hydroxyl airglow (intensities and temperatures) at Bear Lake Observatory (Utah, 42°N,115°W), but the 6-8 year means do show a characteristic airglow ``springtime transition'' (AST) near the end of March. MF radars from Tromsø (70°N,19°E), Juliusruh (55°N,13°E) and Saskatoon (52°N,107°W) demonstrate springtime reversals in the mean (daily) zonal winds at 85-95km, both annually and in 8 year means, at times near the airglow ``transitions''. The ``tongue'' of easterlies (near March 30) is a long-established feature of mesopause dynamics, and clear indications of associated changes in tides and gravity wave fluxes are also presented.
The TIME-GCM is also used to investigate the characteristics of the airglow and winds during the interval associated with the AST events. Useful similarities with the observed variations are demonstrated.

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