Daily Sunspot Evaluation
Observation Sheet Saturday, 13 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)
- 28
- Relative number (R)
- 88
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 11 | 14 | 12E | 268 | |||
| 2 | G – 2 | 18 | 62E | 218 | |||
| 3 | ? – 1 | -12 | 80E | 200 | |||
| 4 | A – 1 | -14 | 78W | 358 | |||
| 5 | C – 12 | 14 | 55W | 335 | |||
| 6 | A – 1 | 18 | 18W | 298 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.