Daily Sunspot Evaluation
Observation Sheet Thursday, 31 January 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)
- 20
- Relative number (R)
- 120
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570131.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 9 | 14 | 2E | ||||
| 2 | A – 1 | 16 | 40E | ||||
| 3 | C – 2 | 18 | 67E | ||||
| 4 | J – 1 | -19 | 60E | ||||
| 5 | A – 1 | -18 | 5E | ||||
| 6 | A – 1 | -20 | 15W | ||||
| 7 | J – 1 | -20 | 27W | ||||
| 8 | A – 2 | 19 | 64W | ||||
| 9 | J – 1 | 23 | 63W | ||||
| 10 | A – 1 | 34 | 48W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.