Daily Sunspot Evaluation
Observation Sheet Saturday, 12 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)
- 12
- Number of spots (f)
- 94
- Relative number (R)
- 214
- Observer
- SM
- Reading
- all checks consistent
- File
- 19810912.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 10 | 30 | 47W | 84 | 50W | 6 | |
| 2 | AXX – 1 | 17 | 42W | 79 | 45W | - | |
| 3 | EKC – 41 | 9 | 28W | 65 | 31W | 14 | |
| 4 | AXX – 2 | 0 | 22W | 59 | 25W | - | |
| 5 | HAX – 3 | 15 | 18W | 55 | 21W | 4E | |
| 6 | BXI – 12 | 15 | 17W | 54 | 20W | 25 | |
| 7 | AXX – 1 | 9 | 11W | 48 | 14W | - | |
| 8 | AXX – 1 | 16 | 50E | 347 | 47E | - | |
| 9 | DKI – 8 | 18 | 60E | 337 | 57E | 10 | |
| 10 | DAO – 3 | -17 | 70W | 107 | 73W | 9 | |
| 11 | BXO – 7 | -8 | 09W | 46 | 12W | 6 | |
| 12 | BXO – 5 | -19 | 29E | 8 | 26E | 4 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.