Sunspot drawing of 1987-3-31

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https://doi.org/10.7891/e-manuscripta-142951



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1987-03-31
09:45
Hs 1304.6:1867
https://doi.org/10.7891/e-manuscripta-142951
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
22 15 20 C 4 293
1 15 20