Daily Sunspot Evaluation
Observation Sheet Tuesday, 11 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)
- 9
- Number of spots (f)
- 96
- Relative number (R)
- 186
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810811.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSI – 4 | 15 | 58W | 158 | 62W | 6 | |
| 2 | HHX – 1 | 11 | 26W | 126 | 30W | 3 | |
| 3 | HKX – 4 | 25 | 10E | 90 | 06E | 3 | |
| 4 | CPI – 14 | -25 | 45W | 145 | 49W | 8 | |
| 5 | FKC – 69 | -10 | 19W | 119 | 23W | 20E | |
| 6 | HSX – 1 | -13 | 13E | 87 | 09E | 1 | |
| 7 | PXX – 1 | -9 | 45E | 55 | 41E | - | |
| 8 | HAX – 1 | -31 | 59E | 41 | 55E | 1 | |
| 9 | PXX – 1 | -15 | 63E | 37 | 59E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.