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Proposed geomagnetic control of semiannual waves in the mesospheric zonal windThe polar semiannual oscillation in zonal wind explains midwinter weakening of the polar vortex and the relatively short stratospheric and mesospheric summer easterlies. The phase of the wind oscillation is equinoctial, as is the phase of the semiannual component in magnetic storm activity. For a given altitude, the contours of amplitude of the semiannual wind oscillation have less variability in geomagnetic than in geographic coordinates. It is suggested that the polar wind oscillations are caused by the semiannual maxima in magnetic storm activity, which lead to electron dissociation of O2 into O, in turn increasing ozone more rapidly than the dissociation of N2 destroys ozone, and inducing a semiannual variation in the thermal and wind fields. This implies that geomagnetic processes may cause or affect the development of sudden warmings. As the tropical semiannual wind oscillation is symmetric about the geomagnetic equator, the same processes may also influence the location of the tropical wind wave.
Document ID
Document Type
Conference Paper
Belmont, A. D.
(Control Data Corp. Greenbelt, MD, United States)
Nastrom, G. D.
(Control Data Corp.)
Mayr, H. G.
(NASA Goddard Space Flight Center)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Publication Information
Publication: Possible Relationships between Solar Activity and Meteorol. Phenomena
Subject Category
Accession Number
Funding Number(s)
CONTRACT_GRANT: N00014-72-C-0308
Distribution Limits
Work of the US Gov. Public Use Permitted.
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