Sunspot drawing of 1981-4-28

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https://doi.org/10.7891/e-manuscripta-139153



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1981-04-28
07:00
Hs 1304.6:100
https://doi.org/10.7891/e-manuscripta-139153
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
209 9 10 C 16 31
210A 7 8 J 3 20
211 22 15 B 3 26
213 1 3 J 21 342
214 2 3 A 4 344
215 5 4 B -14 17
6 46 43