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Ann. Geophys., 26, 1999-2004, 2008
www.ann-geophys.net/26/1999/2008/
© European Geosciences Union 2008
Solar activity affects the occurrence of synoptic types over Europe
R. Huth1, J. Kyselý1, J. Bochníček2, and P. Hejda2
1Institute of Atmospheric Physics, Boční II 1401, 141 31 Praha 4, Czech Republic
2Institute of Geophysics, Boční II 1401, 141 31 Praha 4, Czech Republic
Abstract. The solar effects on tropospheric circulation over Europe are investigated
by counting the occurrence of Hess-Brezowsky synoptic types under various
levels of solar activity. Solar minima are accompanied by a lower incidence
of westerly types and a higher incidence of easterly and northerly types.
The types with a northeast and northwest flow are most frequent under a
moderate solar activity. There is a weak tendency towards the anticyclonic
(cyclonic) types to be less (more) frequent under moderate solar activity.
Our results are in accord with previous studies, indicating a strengthened
zonal flow in solar maxima and changes in the modes of low-frequency
circulation variability. The results point to the fact that the effects of
solar activity are not linear.
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