Daily Sunspot Evaluation
Observation Sheet Thursday, 12 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)
- 84
- Relative number (R)
- 184
- Observer
- GT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810212,.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 8 | 9 | 49W | 6 | 52W | 5 | |
| 2 | AXX – 1 | 29 | 32W | 349 | 35W | ||
| 3 | FKC – 49 | 12 | 16W | 322 ⚠ | 19W | 18.5 | |
| 4 | CAI – 5 | 19 | 59E | 258 | 56E | 10.5 | |
| 5 | HKX – 2 | 12 | 60E | 257 | 57E | 3.5 | |
| 6 | ? – 1 | 15 | 80E | 237 | 77E | ||
| 7 | BXI – 10 | -17 | 23W | 340 | 260W | 5 | |
| 8 | AXX – 2 | -21 | 15W | 332 | 18W | 0.75 | |
| 9 | CAO – 5 | -8 | 04W | 321 | 07W | 6 | |
| 10 | HAX – 1 | -19 | 61E | 256 | 58E | 1.75 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.