Daily Sunspot Evaluation
Observation Sheet Wednesday, 22 September 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)
- 7
- Number of spots (f)
- 31
- Relative number (R)
- 101
- Observer
- HM
- Reading
- all checks consistent
- File
- 19710922.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 12 | 50E | 190 | |||
| 2 | C – 3 | -10 | 53E | 187 | |||
| 3 | B – 4 | -5 | 10E | 230 | |||
| 4 | C – 7 | -11 | 41W | 281 | |||
| 5 | J – 1 | 4 | 41W | 281 | |||
| 6 | E – 13 | 12 | 55W | 295 | |||
| 7 | B – 2 | 12 | 75W | 313 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.