Daily Sunspot Evaluation
Observation Sheet Thursday, 17 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)
- 7
- Number of spots (f)
- 30
- Relative number (R)
- 100
- Observer
- AT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19690717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 5 | 42 | 83E | 238 | |||
| 2 | A – 1 | -18 | 29W | 350 | |||
| 3 | C – 6 | -16 | 58W | 19 | |||
| 4 | C – 4 | 6 | 42W | 333 ⚠ | |||
| 5 | A – 5 | 16 | 30W | 351 | |||
| 6 | D – 7 | 21 | 47W | 8 | |||
| 7 | H – 2 | 14 | 42W | 333 ⚠ |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.