The Umbra–Penumbra Area Ratio of Sunspots During the Maunder Minimum
Author:
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Link
http://stacks.iop.org/0004-637X/865/i=2/a=88/pdf
Reference28 articles.
1. On the umbra-penumbra area ratio of sunspots
2. Sunspot Observations During the Maunder Minimum from the Correspondence of John Flamsteed
3. A Curious History of Sunspot Penumbrae: An Update
4. Sunspots During the Maunder Minimum from Machina Coelestis by Hevelius
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