Daily Sunspot Evaluation
Observation Sheet Friday, 12 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)
- 12
- Relative number (R)
- 72
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 18 | 74E | 219 | |||
| 2 | A – 1 | -10 | 12W | 305 | |||
| 3 | G – 2 | -16 | 60W | 353 | |||
| 4 | ? – 1 | -7 | 82W | 15 | |||
| 5 | B – 5 | 14 | 41W | 334 | |||
| 6 | J – 1 | 18 | 05W | 298 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.