Sunspot drawing of 1987-4-17

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https://doi.org/10.7891/e-manuscripta-142822



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1987-04-17
07:00
Hs 1304.6:1880
https://doi.org/10.7891/e-manuscripta-142822
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
26 16 24 D -32 127
27 11 17 C -32 133
29 2 4 J -7 126
3 29 45