Sunspot drawing of 1987-7-21

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https://doi.org/10.7891/e-manuscripta-142971



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1987-07-21
08:30
Hs 1304.6:1962
https://doi.org/10.7891/e-manuscripta-142971
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
68 7 12 J -31 242
69 11 14 B -28 256
70 11 26 D -23 184
71 12 15 C 20 251
4 41 67