Sunspot drawing of 1987-3-20

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https://doi.org/10.7891/e-manuscripta-142893



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1987-03-20
09:00
Hs 1304.6:1857
https://doi.org/10.7891/e-manuscripta-142893
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
19 1 1 A -18 124
20 2 2 A 23 77
2 3 3