Daily Sunspot Evaluation
Observation Sheet Monday, 9 February 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)
- 80
- Relative number (R)
- 160
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810209.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HKX – 3 | 18 | 65W | 61 | 66W | 6 | |
| 2 | ARX – 3 | 22 | 64W | 60 | 65W | 1.5 | |
| 3 | HSX – 1 | 3 | 25W | 21 | 26W | 1 | |
| 4 | ARX – 4 | 4 | 07W | 3 | 08W | 2 | |
| 5 | FKC – 53 | 12 | 23E | 333 | 22E | 19.5 | |
| 6 | EKI – 10 | -15 | 75W | 71 | 76W | 13 | |
| 7 | HSX – 1 | -8 | 44W | 40 | 45W | 1 | |
| 8 | CSI – 5 | -18 | 17E | 339 | 16E | 4.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.