Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986s%26w....25..128b&link_type=abstract
Sterne und Weltraum (ISSN 0039-1263), vol. 25, March 1986, p. 128-134. In German.
Physics
1
Solar Activity, Solar Cycles, Solar Granulation, Line Spectra, Photosphere, Solar Magnetic Field, Solar Spectra, Sunspot Cycle
Scientific paper
It is pointed out that the 11-year solar activity cycle is of basic importance for a number of phenomena on the sun itself, in interplanetary space, and on earth. A number of decades ago, the possibility was considered that changes in the structure of granulation are a function of the solar activity cycle. The observational techniques existing at that time could not provide an unequivocal answer to this question. In the last few years, the number of observations which indicate cyclic chanages in the structure of granulation has increased. The characteristics of granulation are discussed, taking into account the flow and velocity of matter, changes regarding the size and appearance of the granules on the sun, the magnetic fields on the sun, and differences between characteristics in active and quiet areas. Attention is also given to new information obtained with the aid of an observational method which is based on an analysis of the light integrated over the entire visible solar disk.
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