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On diurnal variations of the solar rotation rate as derived from sunspot tracings

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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.).

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Authors and Affiliations

  1. Universitäts-Sternwarte Göttingen, Göttingen, F.R.G.

    A. Koch & H. Wöhl

  2. Kiepenheuer-Institut für Sonnenphysik, Freiburg, F.R.G.

    E. H. Schröter

Authors
  1. A. Koch
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  2. H. Wöhl
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  3. E. H. Schröter
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Additional information

Mitteilungen aus dem Kiepenheuer-Institut Nr. 191.

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Koch, A., Wöhl, H. & Schröter, E.H. On diurnal variations of the solar rotation rate as derived from sunspot tracings. Sol Phys 71, 395–399 (1981). https://doi.org/10.1007/BF00167561

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  • DOI: https://doi.org/10.1007/BF00167561

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