Sunspot drawing of 1987-9-18

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https://doi.org/10.7891/e-manuscripta-142985



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1987-09-18
08:00
Hs 1304.6:2020
https://doi.org/10.7891/e-manuscripta-142985
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
97 11 13 C -31 226
100 1 1 A 24 225
101 1 3 J 13 132
102 2 4 B -29 191
4 15 21