Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 May 1958
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 12
- Number of spots (f)
- 41
- Relative number (R)
- 161
- Observer
- MH
- Reading
- all checks consistent
- File
- 19580521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 6 | 21 | 27E | ||||
| 2 | C – 7 | 9 | 18E | ||||
| 3 | J – 1 | 18 | 46E | ||||
| 4 | ? – 1 | 9 | 75E | ||||
| 5 | ? – 1 | -16 | 75E | ||||
| 6 | J – 1 | -24 | 13W | ||||
| 7 | H – 1 | -24 | 36W | ||||
| 8 | ? – 2 | -20 | 76W | ||||
| 9 | G – 4 | -7 | 25W | ||||
| 10 | ? – 1 | 18 | 70W | ||||
| 11 | D – 5 | 24 | 29W | ||||
| 12 | D – 11 | 40 | 4W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.