Sunspot drawing of 1987-3-17

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https://doi.org/10.7891/e-manuscripta-142993



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1987-03-17
08:15
Hs 1304.6:1854
https://doi.org/10.7891/e-manuscripta-142993
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
17 1 3 J -32 76
19 7 11 B -18 121
2 8 14