Daily Sunspot Evaluation
Observation Sheet Sunday, 31 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)
- 25
- Relative number (R)
- 75
- Observer
- SK
- Reading
- all checks consistent
- File
- 19711031.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 1 | 11 | 04E | 80 | |||
| 2 | ? – 1 | -10 | 82E | 2 | |||
| 3 | J – 5 | -15 | 01E | 83 | |||
| 4 | B – 10 | -12 | 05W | 89 | |||
| 5 | H – 8 | -8 | 49W | 133 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.