Daily Sunspot Evaluation
Observation Sheet Friday, 11 September 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)
- 14
- Number of spots (f)
- 119
- Relative number (R)
- 259
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810911.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 12 | 78W | 128 | 81W | 3 | |
| 2 | AXX – 2 | 17 | 45W | 95 | 48W | - | |
| 3 | BXI – 20 | 29 | 37W | 87 | 40W | 11 | |
| 4 | BXO – 3 | 17 | 27W | 77 | 30W | 3.5 | |
| 5 | FKC – 52 | 10 | 13W | 63 | 16W | 16 | |
| 6 | AXX – 2 | 0 | 13W | 63 | 16W | - | |
| 7 | CAI – 6 | 14 | 03W | 53 | 06W | 6 | |
| 8 | BXI – 5 | 10 | 02W | 52 | 05W | 3.5 | |
| 9 | DKO – 6 | 18 | 74E | 336 | 71E | 10 | |
| 10 | ? – 5 | -11 | 82W | 132 | 85W | ? | |
| 11 | HKX – 2 | -17 | 74W | 124 | 77W | 6 | |
| 12 | BXI – 5 | -17 | 54W | 104 | 57W | 6 | |
| 13 | BXO – 9 | -8 | 02E | 48 | 01W | 4.5 | |
| 14 | AXX – 1 | -31 | 11E | 39 | 08E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.