Daily Sunspot Evaluation
Observation Sheet Thursday, 31 July 1969
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)
- 8
- Number of spots (f)
- 84
- Relative number (R)
- 164
- Observer
- AT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19690731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 8 | 80E | 55 ⚠ | |||
| 2 | ? – 8 | -12 | 73E | 62 ⚠ | |||
| 3 | A – 2 | -16 | 30E | 405 ⚠ | |||
| 4 | F – 52 | -8 | 41E | 424 ⚠ | |||
| 5 | H – 12 | -17 | 45W | 450 ⚠ | |||
| 6 | A – 1 | -17 | 38W | 173 ⚠ | |||
| 7 | A – 4 | -12 | 42W | 177 ⚠ | |||
| 8 | C – 4 | 27 | 55W | 490 ⚠ |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.