Daily Sunspot Evaluation
Observation Sheet Friday, 18 December 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)
- 9
- Number of spots (f)
- 28
- Relative number (R)
- 118
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19811218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 18 | 85W | 283 | 88W | - | |
| 2 | DAO – 4 | 13 | 06W | 204 | 09W | - | |
| 3 | AXX – 1 | 26 | 22E | 176 | 19E | - | |
| 4 | AXX – 1 | 15 | 41E | 157 | 38E | - | |
| 5 | ? – 1 | 11 | 85E | 113 | 82E | - | |
| 6 | HKX – 3 | -14 | 77W | 275 | 80W | 6 | |
| 7 | HKX – 1 | -6 | 63W | 261 | 66W | 3 | |
| 8 | CSI – 3 | -8 | 46W | 244 | 49W | 4 | |
| 9 | DAI – 13 | -9 | 13E | 185 | 10E | 5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.