Daily Sunspot Evaluation
Observation Sheet Thursday, 13 February 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)
- 11
- Number of spots (f)
- 54
- Relative number (R)
- 164
- Observer
- WG
- Reading
- all checks consistent
- File
- 19580213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 23 | 57E | ||||
| 2 | B – 2 | 15 | 52E | ||||
| 3 | C – 3 | 6 | 70E | ||||
| 4 | A – 1 | -24 | 43E | ||||
| 5 | B – 3 | -16 | 43W | ||||
| 6 | E – 9 | -20 | 52W | ||||
| 7 | H – 1 | -14 | 69W | ||||
| 8 | C – 3 | 26 | 43W | ||||
| 9 | D – 11 | 9 | 18W | ||||
| 10 | A – 1 | 19 | 4W | ||||
| 11 | E – 19 | 10 | 2W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.