Long-term variation in distribution of sunspot groups

Details Long-term variation in distribution of sunspot groups Long-term variation in distribution of sunspot groups

2006-06-02

arxiv.org/abs/astro-ph/0606053v1

Astron.Astrophys. 424 (2004) 311-315

Astronomy and Astrophysics

Astrophysics

4 pages

Scientific paper

10.1051/0004-6361:20040550

We studied the relation between the distribution of sunspot groups and the Gleissberg cycle. As the magnetic field is related to the area of the sunspot groups, we used area-weighted sunspot group data. On the one hand, we confirm the previously reported long-term cyclic behaviour of the sum of the northern and southern sunspot group mean latitudes, although we found a somewhat longer period (P~104 years). We introduced the difference between the ensemble average area of sunspot groups for the two hemispheres, which turns out to show similar behaviour. We also investigated a further aspect of the Gleissberg cycle where while in the 19th century the consecutive Schwabe cycles are sharply separated from each other, one century later the cycles overlap each other more and more.

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