Sunspot drawing of 1987-9-21

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https://doi.org/10.7891/e-manuscripta-142947



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1987-09-21
07:30
Hs 1304.6:2023
https://doi.org/10.7891/e-manuscripta-142947
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
97 4 6 B -31 223
101 2 4 J 13 132
102 6 10 C -29 192
3 12 20