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Trains in our world
Rajchl, Jaroslav
According to e.g. St. Thomas the human history is connected with the mankind behaviour which is well known is tighly connected with the solar activity during its 500 year periodicity. Owing to this activity trains of various shapes and duration are induced; they are in an interesting correspondence to different typical processes in the mankind history.
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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.
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