Daily Sunspot Evaluation
Observation Sheet Saturday, 31 July 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)
- 32
- Relative number (R)
- 92
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 6 | 10 | 22E | 196 | |||
| 2 | A – 2 | 10 | 32E | 187 | |||
| 3 | C – 11 | 7 | 30E | 189 | |||
| 4 | C – 10 | -13 | 12W | 231 | |||
| 5 | J – 2 | -7 | 23W | 242 | |||
| 6 | J – 1 | -13 | 58W | 277 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.