Daily Sunspot Evaluation
Observation Sheet Tuesday, 10 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)
- 93
- Relative number (R)
- 193
- Observer
- GT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810210,.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 18 | 39W | 63 ⚠ | 82W | ||
| 2 | HSX – 1 | 4 | 38W | 22 | 41W | 1 | |
| 3 | AXX – 5 | 9 | 19W | 3 | 22W | 3 | |
| 4 | BXO – 7 | 4 | 18W | 2 | 21W | 4.5 | |
| 5 | AXX – 1 | 29 | 08W | 352 | 11W | ||
| 6 | AXX – 5 | 22 | 06E | 328 ⚠ | 03E | 2 | |
| 7 | FKC – 58 | 12 | 11E | 323 ⚠ | 08E | 19.5 | |
| 8 | BXO – 5 | -7 | 58W | 42 | 61W | 5.5 | |
| 9 | AXX – 1 | -17 | 43W | 27 | 46W | ||
| 10 | BXO – 8 | -18 | 06E | 328 ⚠ | 03E | 8.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.