Daily Sunspot Evaluation
Observation Sheet Thursday, 11 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)
- 9
- Number of spots (f)
- 34
- Relative number (R)
- 124
- Observer
- LT
- Reading
- all checks consistent
- File
- 19690911.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 9 | 04E | 299 | |||
| 2 | A – 1 | 13 | 15E | 285 | |||
| 3 | A – 1 | 9 | 09E | 291 | |||
| 4 | ? – 3 | 14 | 69E | 231 | |||
| 5 | ? – 1 | -2 | 80E | 220 | |||
| 6 | H – 6 | -19 | 51E | 249 | |||
| 7 | D – 18 | -32 | 25W | 325 | |||
| 8 | J – 1 | 23 | 44W | 344 | |||
| 9 | A – 1 | 24 | 37W | 337 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.