Daily Sunspot Evaluation
Observation Sheet Friday, 18 August 1972
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)
- 4
- Number of spots (f)
- 40
- Relative number (R)
- 80
- Observer
- FA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19720818.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 15 | -11 | 11E | 180 | |||
| 2 | C – 6 | -26 | 26E | 165 | |||
| 3 | D – 17 | 15 | 50W | 241 | |||
| 4 | A – 2 | 18 | 29W | 250 ⚠ |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.