Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 October 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)
- 5
- Number of spots (f)
- 23
- Relative number (R)
- 73
- Observer
- HA
- Reading
- all checks consistent
- File
- 19711012.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 12 | 13E | 320 | |||
| 2 | C – 7 | 12 | 35E | 298 | |||
| 3 | A – 7 | 1 | 27E | 306 | |||
| 4 | C – 6 | -13 | 04E | 329 | |||
| 5 | A – 1 | 11 | 48W | 21 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.