Daily Sunspot Evaluation
Observation Sheet Tuesday, 31 August 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)
- 4
- Number of spots (f)
- 8
- Relative number (R)
- 48
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710831.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | -10 | 71E | 99 | |||
| 2 | A – 2 | -10 | 65W | 235 | |||
| 3 | J – 1 | -4 | 65W | 235 | |||
| 4 | A – 4 | 5 | 31W | 201 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.