Geomagnetic activity signatures in wintertime stratosphere w

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TitleGeomagnetic activity signatures in wintertime stratosphere wind, temperature, and wave responseAbstractWe 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 (âˆ¼ 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. Â© 2013. American Geophysical Union. All Rights Reserved.

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1st AuthorSeppälä, A. AuthorSeppälä, A.Lu, H.Clilverd, M.Rodger, C.Year2013JournalJournal of Geophysical Research AtmospheresVolume118Number5Pages2169-2183DOI10.1002/jgrd.50236URLhttps://www.scopus.com/inward/recor.....bbb86d4a8220e601e179ad83bPublisherBlackwell Publishing LtdKeywordsPrecipitation (chemical)Upper atmosphereVortex flowWave propagation, Energetic particlesGeomagnetic activitiesGeomagnetic effectsNorthern HemispheresQuasi-biennial oscillationStratospheric polar vortexWave-mean-flow interactionZonal-mean zonal winds, Geomagnetism, data interpretationdata setgeomagnetic fieldgeomagnetismirradianceNorthern Hemisphereplanetary wavepolar vortexquasi-biennial oscillationstratospherewave modelingwinterzonal windAuthor Keywordsenergetic particle precipitationgeomagnetic activitystratospherewave-mean flow interaction

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CitationSeppÃ¤lÃ¤, A., Lu, H., Clilverd, M. and Rodger, C. (2013). Geomagnetic activity signatures in wintertime stratosphere wind, temperature, and wave response. Journal of Geophysical Research Atmospheres, 118(5):2169-2183