Daily Sunspot Evaluation
Observation Sheet Monday, 17 August 1981
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)
- 67
- Relative number (R)
- 147
- Observer
- AÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810817.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 2 | -11 | 35W | 55 | 38W | 0.5 | |
| 2 | BXO – 2 | -20 | 04W | 24 | 07W | 3.5 | |
| 3 | FKC – 35 | -16 | 14E | 6 | 11E | 17 | |
| 4 | DKI – 16 | -7 | 39E | 341 | 36E | 4 | |
| 5 | BXO – 4 | -6 | 52E | 328 | 49E | 4 | |
| 6 | HAX – 1 | -2 | 55E | 325 | 52E | 2.5 | |
| 7 | DKO – 4 | -17 | 58E | 302 ⚠ | 55E | 10.5 | |
| 8 | AXX – 3 | -7 | 61E | 310 ⚠ | 58E | 5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.