On diurnal variations of the solar rotation rate as derived from sunspot tracings |
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| Authors: | A Koch H Wöhl E H Schröter |
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| Institution: | (1) Universitäts-Sternwarte Göttingen, Göttingen, F.R.G.;(2) Kiepenheuer-Institut für Sonnenphysik, Freiburg, F.R.G. |
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| Abstract: | The heliographic positions of more than 100 sunspots were accurately measured several times a day from 1974 until 1979 by means of the computer-controlled tracing method described by Schröter and Wöhl (1975). A striking degree of constancy of the solar rotation rate (about 0.15% or 3 m s–1) is found, when east-west proper motion components of each individual stable sunspot is considered. However, large differences of the rotation rate are observed (up to 7% or 130 m s–1) when comparing different sunspots. We found no significant correlation of these fluctuations with characteristics of the sunspots (age, evolution, etc.).Mitteilungen aus dem Kiepenheuer-Institut Nr. 191. |
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