Daily Sunspot Evaluation
Observation Sheet Saturday, 11 February 1961
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)
- 3
- Number of spots (f)
- 10
- Relative number (R)
- 40
- Observer
- BG
- Reading
- all checks consistent
- File
- 19610211.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | -10 | 0 | ||||
| 2 | H – 6 | -9 | 3W | ||||
| 3 | J – 2 | 4 | 25W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.