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	The effect of severe geomagnetic storms on the atmospheric circulation in the winter Northern Hemisphere Bochníček, Josef ; Davídkovová, Hana ; Hejda, Pavel ; Huth, Radan The aim of this paper is to investigate the effects of isolated strong geomagnetic storms on the atmospheric circulation in the winter Northern Hemisphere. For this purpose pressure fields between the SLP and 20 hPa level were analyzed in winter months of 1955-2003. The obtained results indicate that the impact of geomagnetic storms is modulated by solar activity, phase of quasibiennial oscillation and by some inherent atmospheric processes such as the appearance of blocks over British Isles. Detailed record
	Association between Solar Proton Events and pressure decreases in the cold periods of the northern troposphere Bochníček, Josef ; Davídkovová, Hana ; Hejda, Pavel ; Huth, Radan Veretenko and Thejll's (JASTP, 2004) study of the relation between the increase of solar energetic proton flux and the changes in the northern troposphere pressure and temperature during cold perios (October-March) of years 1980-1989 has shown that increased SEP flux used to be associated, with delay 1-3 days, with the pressure decrease in the region between Greenland and Iceland. Our contribution extended the studies over years 1990-2003. The results obtained are in good agreement with the phenomenon described by Veretenko and Thejll. Detailed record
	The influence of geomagnetic activity on the course of stratospheric warming Davídkovová, Hana ; Bochníček, Josef ; Hejda, Pavel ; Huth, Radan The temperature of the winter polar lower stratosphere is affected except the solar activity and atmospheric circulation by the geomagnetic activity as well. Plausible physical mechanism for its effect was described by Arnold and Robinson. According to this paper, warming in the lower thermosphere caused by geomagnetic activity produces the reduction of blending mid and high latitude air masses. In consequence of this reduction the temperature of solar insulated region (polar lower stratosphere)decreases. The aim of this work is to verify functionality of such mechanism. Detailed record
	Effects of solar and geomagnetic activity on the occurrence of synoptic situations in Europe Huth, Radan ; Kyselý, Jan ; Bochníček, Josef ; Hejda, Pavel Winter months are divided into three classes according to the mean monthly solar F10.7 flux. Within each class, frequencies of occurrence of groups of Hess-Brezowsky synoptic types are calculated. Detailed record
	Comparison of solar and geomagnetic effects on the atmospheric circulation variability modes Huth, Radan ; Pokorná, Lucie ; Bochníček, Josef ; Hejda, Pavel The shapes, spatial extent, and intensity of modes of low-frequency variability of atmospheric circulation in the Northern Hemisphere in winter are significantly affected by the phase of the 11-yr solar cycle. Here we extend the analysis to the geomagnetic activity, and compare the results with the solar activity. Detailed record
	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. Detailed record
	The influence of the 11-year solar cycle on the Arctic Oscillation Huth, Radan ; Bochníček, Josef ; Hejda, Pavel We study the influence of the solar activity on the Arctic Oscillation, in particular on its intensity and Pacific centre. Detailed record
	Changes in atmospheric circulation in Central Europe and their influence on climate in the Czech Republic Cahynová, Monika ; Huth, Radan This work is concerned with the influence of changes of atmospheric circulation (represented by the Hess-Brezowsky and Brádka’s subjective catalogues of synoptic types) on observed linear trends of 11 climatic elements from 21 stations in the Czech Republic in the period 1961-1998. The ratio of "hypothetical" (caused only by changes in the frequency of synoptic types) and observed trends shows that changes in atmospheric circulation are the primary cause of massive winter warming, and autumn cooling connected with increasing precipitation and humidity. In spring and summer, the influence is insignificant except for precipitation, relative humidity and cloudiness changes that are related to trends in the Hess-Brezowsky catalogue, mostly in spring. Detailed record
	Solar and geomagnetic activity effects on the troposphere behaviour in winter 1981/1982 Bochníček, Josef ; Hejda, Pavel ; Huth, Radan Tha association between the changes in solar/geomagnetic activity and changes in the lower atmosphere pressure, temperature and wind fields was analyzed for the Northern Hemisphere winter of 1981/1982. Detailed record
	Effect of solar activity on the modes of variability of atmospheric circulation Huth, Radan ; Pokorná, Lucie ; Bochníček, Josef ; Hejda, Pavel Solar activity effect on relative intensity and the range of variability modes has been proved. Detailed record

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