Daily Sunspot Evaluation
Observation Sheet Thursday, 11 February 1971
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)
- 6
- Number of spots (f)
- 14
- Relative number (R)
- 74
- Observer
- SK
- Reading
- all checks consistent
- File
- 19710211.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 19 | 07E | 298 | |||
| 2 | A – 1 | -8 | 12E | 293 | |||
| 3 | J – 1 | -10 | 00 | 305 | |||
| 4 | B – 2 | -21 | 45W | 350 | |||
| 5 | H – 2 | -7 | 71W | 16 | |||
| 6 | C – 7 | 14 | 28W | 333 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.