Daily Sunspot Evaluation
Observation Sheet Monday, 11 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)
- 60
- Relative number (R)
- 160
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570211.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 3 | 18 | 3 | |
| 2 | A – 4 | 14 | 29 | |
| 3 | B – 8 | -26 | 48 | |
| 4 | J – 3 | -21 | 13 | |
| 5 | E – 29 | -27 | 5 | |
| 6 | A – 1 | -20 | 51 | |
| 7 | ? – 1 | -20 | 84 | |
| 8 | B – 9 | -14 | 43 | |
| 9 | A – 1 | -12 | 30 | |
| 10 | A – 1 | 24 | 49 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.