Daily Sunspot Evaluation
Observation Sheet Wednesday, 11 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)
- 10
- Number of spots (f)
- 108
- Relative number (R)
- 208
- Observer
- GT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810211,.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HSX – 1 | 3 | 54W | 23 | 55W | 1 | |
| 2 | DAI – 9 | 10 | 37W | 6 | 38W | 5 | |
| 3 | CAO – 9 | 3 | 32W | 1 | 33W | 5 | |
| 4 | HAX – 1 | 29 | 21W | 350 | 22W | 1 | |
| 5 | FKC – 63 | 12 | 04W | 353 ⚠ | 05W | 19.5 | |
| 6 | CAI – 6 | 19 | 71E | 258 | 70E | 10 | |
| 7 | HKX – 1 | 12 | 71E | 258 | 70E | 3 | |
| 8 | CBO – 5 | -7 | 73W | 42 | 74W | 8 | |
| 9 | CAI – 12 | -7 | 08E | 321 | 07E | 5.5 | |
| 10 | HAX – 1 | -19 | 72E | 254 | 71E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.