Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 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)
- 12
- Number of spots (f)
- 110
- Relative number (R)
- 230
- Observer
- HM
- Reading
- all checks consistent
- File
- 19810818.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 5 | 11 | 37W | 44 | 40W | 4 | |
| 2 | BXO – 2 | -9 | 50W | 57 | 53W | 2.5 | |
| 3 | AXX – 1 | -20 | 15W | 22 | 18W | - | |
| 4 | FKC – 48 | -15 | 01W | 8 | 04W | 18.5 | |
| 5 | AXX – 1 | -12 | 24E | 343 | 24E | - | |
| 6 | DKI – 24 | -7 | 25E | 342 | 22E | 5 | |
| 7 | DSO – 8 | -6 | 38E | 329 | 35E | 5.5 | |
| 8 | HAX – 2 | -2 | 41E | 326 | 38E | 2.5 | |
| 9 | DKI – 9 | -17 | 44E | 323 | 41E | 11 | |
| 10 | CKI – 6 | -7 | 48E | 319 | 45E | 6 | |
| 11 | DAO – 3 | -8 | 74E | 293 | 91E | 7.5 | |
| 12 | ? – 1 | -12 | 84E | 283 | 81E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.