Daily Sunspot Evaluation
Observation Sheet Thursday, 4 September 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)
- 6
- Number of spots (f)
- 31
- Relative number (R)
- 91
- Observer
- TY
- Reading
- all checks consistent
- File
- 19690904.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 20 | 19E | 14 | |||
| 2 | A – 1 | 17 | 21E | 12 | |||
| 3 | B – 5 | 18 | 50E | 343 | |||
| 4 | ? – 10 | -11 | 66W | 99 | |||
| 5 | B – 12 | 6 | 51W | 84 | |||
| 6 | A – 1 | 12 | 24W | 57 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.