Daily Sunspot Evaluation
Observation Sheet Friday, 21 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)
- 15
- Number of spots (f)
- 150
- Relative number (R)
- 300
- Observer
- AÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 8 | 11 | 78W | 46 | 81W | 8 | |
| 2 | CAI – 16 | 10 | 20E | 308 | 19E | 65 | |
| 3 | ARX – 1 | 14 | 24E | 304 | 21E | 1 | |
| 4 | ? – 3 | 21 | 80E | 248 | 77E | 6 | |
| 5 | FKC – 32 | -16 | 43W | 11 | 46W | 19 | |
| 6 | CAI – 14 | -7 | 15W | 329 ⚠ | 18W | 34 | |
| 7 | BXO – 6 | -6 | 03W | 331 | 06W | 7 | |
| 8 | HKX – 1 | -3 | 01E | 327 | 02W | 3 | |
| 9 | ECO – 8 | -16 | 03E | 325 | 00 | 14 | |
| 10 | HSX – 4 | -9 | 10E | 318 | 07E | 2 | |
| 11 | DKC – 18 | -8 | 34E | 294 | 31E | 6 | |
| 12 | AXX – 2 | -14 | 35E | 298 ⚠ | 32E | 1 | |
| 13 | DKI – 24 | -12 | 45E | 283 | 42E | 11 | |
| 14 | CAI – 10 | -8 | 64E | 264 | 61E | 11 | |
| 15 | ? – 3 | -7 | 78E | 249 | 75E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.