Sunspot drawing of 2011-2-21

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https://doi.org/10.7891/e-manuscripta-156929



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2011-02-21
09:00
Hs 1304.6:9231
https://doi.org/10.7891/e-manuscripta-156929
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
17 16 20 D 10.9 333.9
18 7 9 D 17.5 337.1
2 23 29