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	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
	Solar energetic events in the years 1996-2004. Analysis of their geoeffectivness Bochníček, Josef ; Hejda, Pavel ; Horáček, Josef Data concerning solar energetic events published in the years 1996-2004 by the USAF/NOAA in the form of their daily reports were collected. Analysis of individual event types shows that the degree of their geoeffectivness depends both on their size and on their solar disc location. The results are summed up in tables and scatter graphs. Detailed record
	The problems connected with geomagnetic activity forecasts in the different phases of the last solar cycle Hejda, Pavel ; Bochníček, Josef The paper analyses the successfulness of forecasts of the geomagnetic disturbed days, carried out in the years 2000-2003. A day was considered as disturbed if geomagnetic activity at the Budkov observatory reached the level "active" or higher. Detailed record
	The relations among the distribution of prevailing winds in the winter Northern Hemisphere, solar/geomagnetic activity and QBO phase Bochníček, Josef ; Hejda, Pavel The effect of solar/geomagnetic activity on the distribution of prevailing winds in the winter Northern Hemisphere was analysed in the winter periods of the years 1964-2001. It was found out, that while the strengthening of zonal flow over the winter North Atlantic was associated with high solar as well as geomagnetic activity, the occurrence of the meridional flow over the winter North Atlantic was associated with low solar activity only. Detailed record
	Analysis of the relation between geomagnetic activity and the phase of the North Atlantic Oscillation Bochníček, Josef ; Hejda, Pavel ; Pýcha, Josef The North Atlantic Oscillation is considered to be a very robust phenomenon. The analysis of tropospheric pressure and temperature deviations from their long-term averages realised on the data set of winter (January-March) periods 1963-2001, as well as wind deviations from their long-term averages pointed at close association between high geomagnetic activity and the positive NAO phase. Detailed record
	Solar and geomagnetic activity effects on wind fields in the Northern hemisphere winter lower troposhere Bochníček, Josef ; Hejda, Pavel The magnitude and prevailing direction of winds in the lower troposphere were analysed in the Northern hemisphere in the winter periods of the years 1964, 1967-1969, 1971-2001. Composite maps of those winds showed marked differences, in particular between the maps in which both activities were simultaneously low or high. Detailed record
	Solar-geomagnetic activity and weather changes. Observation results Bochníček, Josef ; Hejda, Pavel ; Pýcha, Josef The impact of solar and geomagnetic activity on pressure and temperature changes in the winter lower troposphere was investigated. It was found that although correlations between solar and geomagnetic activity in individual winter periods are weak, the pressure and temperature changes show similar magnitudes. Detailed record
	Solar-geomagnetic activity and weather changes. The mechanisms Pýcha, Josef ; Bochníček, Josef ; Hejda, Pavel The mechanisms in the paper described were based on the ideas enabling to explain the observed associations between the short-term changes in solar/geomagnetic activity and short-term changes in the lower atmosphere pressure and temperature fields. Special attention was devoted to the role of planetary waves, electrostatic fields and various phases of the QBO. Detailed record
	Physical plausibility of "Sun-weather" research Bochníček, Josef ; Hejda, Pavel ; Pýcha, Josef The paper deals with the importance of three basic objections against the existence of causal link between the changes of atmospheric fields in the lower troposphere. Detailed record
	Main sources of solar wind high-speed streams during solar minimum Bochníček, Josef ; Hejda, Pavel Common analysis of solar wind (velocity, concentration, temperature) and solar soft X-ray images showed that during the solar minimum substantial majority of the solar wind high-speed streams found its source in the regions with attributes typical for coronal holes. Detailed record

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