Sunspot drawing of 1987-7-20

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https://doi.org/10.7891/e-manuscripta-142986



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1987-07-20
08:00
Hs 1304.6:1961
https://doi.org/10.7891/e-manuscripta-142986
Observer : Michele Bianda
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
68 5 10 H -31 243
69 8 10 B -28 257
70 1 4 J -25 186
3 14 24