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	Solar variability effects on characteristics of the Northern Hemisphere Circumpolar Vortex Paličková, Lea ; Huth, Radan (advisor) ; Bochníček, Josef (referee) This thesis contains an introduction to the problematics of solar activity variations in relation to tropospheric air circulation.It also contains thorough description of the influence of the solar activity on variable aspects of atmospheric circulation in the stratosphere and troposphere. The main target of this thesis is to determine, whether and how much is the Northern Hemisphere Circumpolar Vortex and its characteristics (surface, roundness, location of the centre) influenced by the level of solar activity. In the research part of this thesis, these characteristic values of the northern hemisphere circumpolar vortex from selected months in the years 1959-2001 are used. The thesis conributes to the international project COST ES1005 (Towards a more complete assessment of the impact of solar variability on the Earth's climate). Detailed record
	The effect of high long-lasting solar/geomagnetic activity on pressure fields in the winter northern lower atmosphere Bochníček, Josef ; Davídkovová, Hana ; Hejda, Pavel ; Huth, Radan The effect of high long-lasting solar/geomagnetic activity on stratospheric and tropospheric pressure distributions was investigated in the winter Northern Hemisphere. The analysis concerns winter period (December 1 – March 30) in 1952-2003. Solar activity is characterized by 30 day means of R number, geomagnetic activity by 30 day means of daily sum of Kp index. Stratospheric and tropospheric pressure distributions are described by 30 day mean anomalies in geopotential height (GPH) at 50 hPa/500 hPa. GPH anomalies are computed as the difference between the long-term 30 day averages (covering 33 year period, 1970-2003) and actual 30 day averages. Data are taken from the NCEP/NCAR reanalysis Detailed record
	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
	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

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