Daily Sunspot Evaluation
Observation Sheet Thursday, 22 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)
- 10
- Number of spots (f)
- 49
- Relative number (R)
- 149
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710722.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 19 | 41E | 297 | |||
| 2 | A – 2 | 11 | 31E | 307 | |||
| 3 | A – 4 | -8 | 04E | 334 | |||
| 4 | D – 6 | -15 | 00 | 338 | |||
| 5 | A – 3 | -1 | 16W | 354 | |||
| 6 | G – 9 | 6 | 50W | 28 | |||
| 7 | J – 2 | 7 | 25W | 3 | |||
| 8 | D – 6 | 9 | 37W | 15 | |||
| 9 | C – 11 | 13 | 14W | 352 | |||
| 10 | J – 4 | 15 | 00 | 338 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.