Sunspot drawing of 1987-1-31

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https://doi.org/10.7891/e-manuscripta-143026



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1987-01-31
09:15
Hs 1304.6:1820
https://doi.org/10.7891/e-manuscripta-143026
Observer : Marco Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
8 2 2 B 12 1
9 3 2 B -37 330
2 5 4