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The Influence of the Evolution of Sunspot Groups on the Determination of the Solar Velocity Field

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Abstract

Meridional motions and differential rotation of stable recurrent sunspot groups from the Greenwich data set are investigated. Simple and complex, as well as younger and older sunspot groups are treated separately. There is no difference in behavior of the meridional motions for the simple and complex sunspot groups, while complex groups rotate faster than the simple ones. If we attribute the differences of rotational velocities to the errors in position determination, it can be concluded that the rotational velocities determined by using sunspot groups as tracers are slightly overestimated. Both the meridional motions and differential rotation show the same dependence on the age, when simple and complex recurrent sunspot groups are considered.

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Authors and Affiliations

  1. Hvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, HR-10000, Zagreb, Croatia

    D. Ruždjak, R. Brajša & D. Sudar

  2. Kiepenheuer-Institut für Sonnenphysik, Schöneckstr 6, D-79104, Freiburg, Germany

    H. Wöhl

Authors
  1. D. Ruždjak
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  2. R. Brajša
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  3. D. Sudar
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  4. H. Wöhl
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Correspondence to D. Ruždjak.

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Alexander von Humboldt Research Fellow.

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Ruždjak, D., Brajša, R., Sudar, D. et al. The Influence of the Evolution of Sunspot Groups on the Determination of the Solar Velocity Field. Sol Phys 229, 35–43 (2005). https://doi.org/10.1007/s11207-005-3630-9

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  • DOI: https://doi.org/10.1007/s11207-005-3630-9

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