Sunspot drawing of 1987-9-20

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https://doi.org/10.7891/e-manuscripta-143022



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1987-09-20
08:00
Hs 1304.6:2022
https://doi.org/10.7891/e-manuscripta-143022
Observer : Marco Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
97 6 9 B -32 223
101 4 6 J 13 132
102 11 16 B -30 194
3 21 31