Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 February 1957
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)
- 10
- Number of spots (f)
- 24
- Relative number (R)
- 124
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 16 | 65E | ||||
| 2 | J – 1 | 8 | 64E | ||||
| 3 | A – 1 | -24 | 57E | ||||
| 4 | A – 1 | -29 | 24E | ||||
| 5 | J – 2 | -25 | 19E | ||||
| 6 | B – 6 | -22 | 5W | ||||
| 7 | J – 1 | -22 | 13W | ||||
| 8 | C – 7 | -26 | 22W | ||||
| 9 | H – 1 | -26 | 40W | ||||
| 10 | ? – 2 | -14 | 75W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.