Daily Sunspot Evaluation
Observation Sheet Thursday, 20 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)
- 13
- Number of spots (f)
- 122
- Relative number (R)
- 252
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810820.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 8 | 10 | 65W | 45 | 67W | 8 | |
| 2 | CAI – 14 | 10 | 33E | 307 | 31E | 6 | |
| 3 | FKC – 39 | -15 | 29W | 9 | 31W | 195 | |
| 4 | DAI – 14 | -7 | 03W | 343 | 05W | 55 | |
| 5 | AXX – 4 | -15 | 00 | 340 | 02W | 3 | |
| 6 | DAO – 3 | -6 | 10E | 330 | 08E | 7 | |
| 7 | HKX – 1 | -2 | 14E | 326 | 12E | 25 | |
| 8 | DKO – 11 | -17 | 16E | 324 | 14E | 14 | |
| 9 | CSO – 4 | -8 | 20E | 320 | 18E | 65 | |
| 10 | DAC – 10 | -8 | 46E | 294 | 44E | 6 | |
| 11 | AXX – 2 | -14 | 47E | 293 | 45E | 1 | |
| 12 | DAI – 10 | -13 | 57E | 283 | 55E | 10 | |
| 13 | AXX – 2 | -8 | 72E | 268 | 70E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.