Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...332..748p&link_type=abstract
Astronomy and Astrophysics, v.332, p.748-754 (1998)
Astronomy and Astrophysics
Astrophysics
33
Sun: Activity, Sun: Photosphere, Sun: Rotation, Sunspots
Scientific paper
Data from the whole era of modern sunspot observations (1853-1996) from four different sources is considered. We find that rotation is continuously changing, not only in the course of a cycle but also in a longer time period. We also find strong fluctuations in the equatorial rotation in the course of a sunspot cycle which can be connected with the observed north/south asymmetry of rotation. The importance of age dependence on rotation is emphasized, both for non-recurrent and recurrent sunspots as the slowing down of rotation along with the age is confirmed.
Pulkkinen Pentti
Tuominen Ilkka
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