First solar butterfly diagram from Schwabe's observations in 1825-1867

Details First solar butterfly diagram from Schwabe's observations in 1825-1867 First solar butterfly diagram from Schwabe's observations in 1825-1867

2010-10-15

arxiv.org/abs/1010.3131v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

3 pages, 1 figure, Proceedings of IAU symposium 273, Physics of Sun and star spots, Ventura, California 22-26 August 2010

Scientific paper

The original sunspot observations by Heinrich Samuel Schwabe of 1825-1867 were digitized and a first subset of spots was measured. In this initial project, we determined more than 14 000 sunspot positions and areas comprising about 11% of the total amount of spots available from that period. The resulting butterfly diagram has a typical appearance, but with evident north-south asymmetries.

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