Sunspot drawing of 1987-4-23

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https://doi.org/10.7891/e-manuscripta-143004



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1987-04-23
07:30
Hs 1304.6:1886
https://doi.org/10.7891/e-manuscripta-143004
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
37 3 2 A -25 2
38 10 8 B 26 30
39 3 5 J 4 298
3 16 15