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Astron. Astrophys. 332, 755-760 (1998)

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Velocity structures from sunspot statistics in cycles 10 to 22

II. Latitudinal velocity and correlation functions

Pentti Pulkkinen 1, 2 and Ilkka Tuominen 2

1 Department of Physics, Theory Division P.O. Box 9, FIN-00014, University of Helsinki, Finland
2 Department of Geosciences and Astronomy, University of Oulu, P.O. Box 333, FIN-90571 Oulu, Finland

Received 11 July 1996 / Accepted 11 December 1997


From sunspot observations between 1853-1996 we calculate latitudinal velocities and correlation functions - the Reynolds stress and the helicity. Latitudinal motions exist, but their behaviour is not certain. The Reynolds stress is strongly present but the helicity is negligible.

Key words: Sun: activity; photosphere; sunspots

Send offprint requests to: Pentti Pulkkinen


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© European Southern Observatory (ESO) 1998

Online publication: March 23, 1998