Daily Sunspot Evaluation
Observation Sheet Thursday, 9 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)
- 5
- Number of spots (f)
- 17
- Relative number (R)
- 67
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710909.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 14 | 29E | 22 | |||
| 2 | A – 1 | -10 | 52E | 359 | |||
| 3 | G – 7 | -8 | 72W | 123 | |||
| 4 | ? – 2 | 2 | 79W | 130 | |||
| 5 | A – 6 | 16 | 45W | 96 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.