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

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.

preprint2010arXivOpen access
Rainer ArltAnastasia Abdolvand
astro-ph.SR
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Open access2 authors1 topic
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Rainer ArltAnastasia Abdolvand

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