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Geomagnetic activity signatures in wintertime stratosphere wind, temperature, and wave response

Seppälä, A.; Lu, H.; Clilverd, M.A.; Rodger, C.J.. 2013 Geomagnetic activity signatures in wintertime stratosphere wind, temperature, and wave response. Journal of Geophysical Research: Atmospheres, 118 (5). 2169-2183. 10.1002/jgrd.50236

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Abstract/Summary

We analyzed ERA-40 and ERA Interim meteorological re-analysis data for signatures of geomagnetic activity in zonal mean zonal wind, temperature, and Eliassen-Palm flux in the Northern Hemisphere extended winter (November–March). We found that for high geomagnetic activity levels, the stratospheric polar vortex becomes stronger in late winter, with more planetary waves being refracted equatorward. The statistically significant signals first appear in December and continue until March, with poleward propagation of the signals with time, even though some uncertainty remains due to the limited amount of data available ( ∼ 50 years). Our results also indicated that the geomagnetic effect on planetary wave propagation has a tendency to take place when the stratosphere background flow is relatively stable or when the polar vortex is stronger and less disturbed in early winter. These conditions typically occur during high solar irradiance cycle conditions or westerly quasi-biennial oscillation conditions.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/jgrd.50236
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Climate
ISSN: 2169897X
Additional Information. Not used in RCUK Gateway to Research.: Not subject to U.S. copyright. Published 2013 American Geophysical Union. Further reproduction or electronic distribution is not permitted.
Additional Keywords: stratosphere, geomagnetic activity, wave-mean flow interaction, energetic particle precipitation
Date made live: 30 Apr 2013 08:13 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/501606

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