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Solar/geomagnetic aktivity, temperature of the winter polar lower stratosphere, the QBO phase and the stratospheric polar vortex
Bochníček, Josef ; Hejda, Pavel ; Huth, Radan ; Davídkovová, Hana
Labitzke (1987) has found a strong correlation between lower stratosphere temperature and solar cycle for data divided according to the QBO phase. This correlation explained why low solar activity combined with QBO-east phase or high solar activity and QBO-west phase was often followed by stratospheric warming and disturbed polar vortex. On th other hand, Arnold and Robinson (2001) have shown that high geomagnetic activity gives rise to cooling of lower stratosphere and leads to the strenghtening of polar vortex.

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