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	Displacements of Doppler velocity fields in sunspots Klvaňa, Miroslav ; Bumba, Václav The mean value of Doppler velocity field in magnetized regions shows a sytematic redshift compared to the neighbouring non-magnetic regions in the range 37 – 191 m/s. Changes in the morphology of the Evershed effect are analyzed. Detailed record
	Regularities in the magnetic field distribution on the Sun in time Bumba, Václav ; Klvaňa, Miroslav Solar background (weak) magnetic fields are very regularly distributed on the solar surface. These regularities change with the range of heliographic latitudes ant they are observable during more than four solar cycles. Detailed record
	Virtual 3D Picture Gallery Klvaňa, Miroslav In the gallery we present stereoscopic couples of images, adjusted for observation of the 3D spatial effect and description of methods, by which we can get the spatial perceiving. The gallery is divided into 3DX gallery for observation of the model images by a method of crossed-eye axes and 3DH gallery for observation of the model images by a method of parallel-eye axes. Detailed record
	Virtual 3D Space Klvaňa, Miroslav We investigate the possibility of a direct visual observation of two color stereoscopic images in order to perceive these images spatially without the use of further technical aids. Such a method of the 3D effect evoking is known since a long time ago, but there are not many information concerning it, and they are mostly very inaccurate. Detailed record
	Zkušenosti s používáním metody local correlation tracking při studiu velkorozměrových rychlostních polí Švanda, Michal ; Sobotka, Michal ; Klvaňa, Miroslav We verify the reliability of the method recently used for the calculation of the large-scale velocity fields on synthetic dopplergrams obtained by a very simple numerical simulation of the supergranular pattern. A series of synthetic dopplergrams was stretched by the known vector field and the LCT was applied. The results were compared with the original vector field. Applying the LCT method on synthetic data we got an important experience in the behaviour of this method when used on full-disc dopplergrams. On the basis of the described tests we assume that the use of LCT on full-disc dopplergrams provides sufficiently reliable results, so that method could be used for mapping the large-scale velocities with resolution 60" and an accuracy 10 m/s. Detailed record
	Modernization of the HSFA solar instruments at the OndĹejov Observatory of the Astronomical institute of the Academy of sciences of the Czech republic Klvaňa, Miroslav ; Bumba, Václav ; Halík, M. ; Ulrich, J. ; Chvojka, M. The two horizontal solar telescopes with spectrographs HSFA at the OndĹejov observatory are modernized for exploitation of both their spectrographs as for the photographic observations, as well as for the registration of spectra with the CCD cameras or photomultipliers. The conception of the reconstruction, emphasizing the new possibilities of both instruments is discussed. Detailed record
	Solar activity impulses Bumba, Václav ; Klvaňa, Miroslav ; Garcia, A. We study the sums of sunspot areas separately for the norhtern and southern hemisphere for each day during the four low activity cycles. During certain time intervals, the solar activity is characterized by isolated, suddenly appearing increases, on one, or simultaneously on both hemispheres. Detailed record
	How did the last cycle of solar activity end and the new one begin Bumba, Václav ; Garcia, A. ; Klvaňa, Miroslav We demonstrate that also during the period of activity minimum on solar surface two active longitudes exist, and that active regions of both cycles closely correlate with them. We study the development of the magnetic fields in this transition phase and, above all, the influence of convection on their distribution. Detailed record
	The influence of the reference zero-velocity on the model of the vector velocity field in a symmetric sunspot Klvaňa, Miroslav ; Bumba, Václav ; Krivcovová, N. It appears that the occurrence of the vector velocity in an umbra caused by the shift of the Doppler-velocity zero-reference level can be successfully corrected by the position change of the point of symmetry of the spot. In such a case, the character of the spot vector velocity field will= be conserved. Detailed record
	Why does the radio activity accompanying the flares in the two large active regions of June 1982 differ so much? Bumba, Václav ; Klvaňa, Miroslav Detailed record

See also: similar author names
2	Klvaňa, Marek
6	Klvaňa, Martin

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