Daily Sunspot Evaluation
Observation Sheet Friday, 24 July 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)
- 166
- Relative number (R)
- 286
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810724.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKC – 44 | 15 | 32W | 10 | 35W | 12.5 | |
| 2 | HAX – 2 | 10 | 31W | 9 | 34W | 2 | |
| 3 | BXI – 6 | 13 | 12E | 326 | 09E | 3.5 | |
| 4 | AXX – 3 | 11 | 64E | 274 | 61E | 3 | |
| 5 | BXO – 2 | -16 | 21W | 359 | 24W | 3 | |
| 6 | BXI – 17 | -20 | 02W | 341 | 06W | 7 | |
| 7 | HKX – 24 | -8 | 01W | 339 | 04W | 8.5 | |
| 8 | BXO – 3 | -8 | 14E | 324 | 11E | 4 | |
| 9 | CAI – 11 | -19 | 15E | 323 | 12E | 8 | |
| 10 | EKC – 51 | -12 | 52E | 286 | 49E | 20 | |
| 11 | HSX – 1 | -19 | 54E | 284 | 51E | 2 | |
| 12 | HHX – 2 | -3 | 65E | 273 | 62E | 3 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.