Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..149s&link_type=abstract
In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2
Physics
Solar Photosphere: Motions
Scientific paper
We determine the vector velocity fields describing the plasma motions in the quiet solar photosphere, using the motions of the supergranular structures, obtained by the analysis of series of Doppler measurements of velocity fields of the whole solar disk. It turned out that the studied vector velocity fields can be submerged under the noise level, originating due to the strong variability of the supergranular structures during their life time. We describe the method we used for the suppressing of such noise, and we bring the criterions used by the election of free parameters. We demonstrate examples of obtained vector velocity fields and of the resulting motions of matter on the visible photospheric surface. We discuss different factors influencing the reproductivness of obtained results. We construct a graph of the dependence of the differential rotation on the heliographic latitude from the mean vector velocity field, we got for the solar disk without expressive magnetic fields.
Bumba Vaclav
Klvana Mirek
Sobotka Michal
Svanda Michal
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