Abstract
Stable recurrent sunspot groups from the Greenwich data set which were identified in at least two subsequent solar rotations were traced. The solar rotation was determined by the period method from the time difference of the two central meridian passages of each of the 327 identified groups. Sidereal rotation periods were calculated from the synodic ones by a seasonal-dependent procedure taking into account the details of the Earth's motion around the Sun. Growing recurrent sunspot groups rotate on the average faster than decaying recurrent sunspot groups, while sunspot groups of all types taken together rotate faster than both growing and decaying recurrent sunspot groups. A north–south rotational asymmetry and a cycle-dependence of rotational velocity of recurrent sunspot groups were analyzed. Positive rotation velocity deviations are larger, but less numerous than the negative ones. Signatures of torsional oscillations were not found analyzing the rotation velocity residual of recurrent sunspot groups as a function of the distance from the average latitude of activity.
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Arévalo, M. J., Gomez, R., Vázquez, M., Balthasar, H., and Wöhl, H.: 1982, Astron. Astrophys. 111, 266.
Balthasar, H. and Wöhl, H.: 1983, Solar Phys. 88, 71.
Balthasar, H., Schüssler, M., and Wöhl, H.: 1982, Solar Phys. 76, 21.
Balthasar, H., Stark, D., and Wöhl, H.: 1987, Astron. Astrophys. 174, 359.
Balthasar, H., Vázquez, M., and Wöhl, H.: 1986, Astron. Astrophys. 155, 87.
Beck, J.G.: 2000, Solar Phys. 191, 47.
Brajša, R. and Wöhl, H.: 2000, Hvar Obs. Bull. 24, 125.
Bruzek, A.: 1961, Z. Astrophys. 51, 75.
Caligari, P., Moreno-Insertis, F., and Schüssler, M.: 1995, Astrophys. J. 441, 886.
Godoli, G., Mazzucconi, F., and Piergianni, I.: 1998, Solar Phys. 181, 295.
Howard, R.: 1984, Ann Rev. Astron. Astrophys. 22, 131.
Howard, R.: 1991, Solar Phys. 135, 327.
Howard, R. and LaBonte, B.: 1980, Astrophys. J. 239, L33.
Howard, R., Gilman, P. A., and Gilman, P. I.: 1984, Astrophys. J. 283, 373.
Koch, A., Wöhl, H., and Schröter, E. H.: 1981, Solar Phys. 71, 395.
Kosovichev, A.: 2001, in P. Murdin (ed.), Encyclopedia Astron. Astrophys., Institute of Physics Publishing, Bristol; Nature Publishing Group, London, Vol. 3, 2602.
Lustig, G.: 1983, Die Sterne 59, 29.
Lustig, G.: 1984, Die Sterne 60, 295.
Lustig, G. and Wöhl, H.: 1991, Astron. Astrophys. 249, 528.
Newton, H. W. and Nunn, M. L.: 1951, Monthly Notices Royal Astron. Soc. 111, 413.
Pulkkinen, P. and Tuominen, I.: 1998, Astron. Astrophys. 332, 748.
Roša, D., Brajša, R., Vršnak, B., and Wöhl, H.: 1995, Solar Phys. 159, 393.
Roša, D., Vršnak, B., Božičc, H., Brajša, R., Ruždjak, V., Schroll, A., and Wöhl, H.:1998, Solar Phys. 179, 237.
Schröter, E. H.: 1985, Solar Phys. 100, 141.
Schüssler, M. and Wöhl, H.: 1997, Astron. Astrophys. 327, 361.
Snodgrass, H.B.: 1992, ASP Conf. Ser. 27, 205.
Stix, M.: 1989, The Sun, Springer-Verlag, Berlin.
Tuominen, J. and Kyröläinen, J.: 1981, Solar Phys. 74, 153.
Tuominen, J. and Kyröläinen, J.: 1982, Solar Phys. 79, 161.
Tuominen, J., Tuominen, I., and Kyröläinen, J.: 1983, Monthly Notices Royal Astron. Soc. 205, 691.
Waldmeier, M.: 1955, Ergebnisse und Probleme der Sonnenforschung, 2nd ed., Akademische Verlagsgesellschaft, Leipzig.
Waldmeier, M.: 1961, The Sunspot-Activity in the Years 1610–1960, Schulthess and Co. AG, Zürich.
Wöhl, H.: 1990, Publ. Debrecen Obs. 7, 19.
Wöhl, H. and Brajša, R.: 2001, Solar Phys. 198, 57.
Zappala, R. A. and Zuccarello, F.: 1991, Astron. Astrophys. 242, 480.
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Brajša, R., Wöhl, H., Vršnak, B. et al. Differential Rotation of Stable Recurrent Sunspot Groups. Solar Physics 206, 229–241 (2002). https://doi.org/10.1023/A:1015064522255
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DOI: https://doi.org/10.1023/A:1015064522255