Daily Sunspot Evaluation
Observation Sheet Thursday, 23 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)
- 8
- Number of spots (f)
- 128
- Relative number (R)
- 208
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810723.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKC – 51 | 16 | 19W | 10 | 22W | 11 | |
| 2 | HAX – 2 | 10 | 14W | 8 | 20W | 2 | |
| 3 | BXI – 11 | -20 | 11E | 340 | 08E | 55 | |
| 4 | HKX – 20 | -8 | 13E | 338 | 10E | 9E | |
| 5 | BRI – 6 | -18 | 29E | 322 | 26E | 45 | |
| 6 | EKC – 36 | -12 | 65E | 286 | 62E | 21 | |
| 7 | HSX – 1 | -19 | 68E | 283 | 65E | 2 | |
| 8 | HSX – 1 | -3 | 78E | 273 | 75E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.