Daily Sunspot Evaluation
Observation Sheet Sunday, 18 October 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)
- 9
- Number of spots (f)
- 149
- Relative number (R)
- 239
- Observer
- OG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19811018.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 13 | 47W | 329 | 50W | 2 | |
| 2 | HAX – 3 | 19 | 46W | 328 | 49W | 4 | |
| 3 | AXX – 2 | 18 | 80E | 252 ⚠ | 27E | 0.5 | |
| 4 | AXX – 1 | 18 | 39E | 243 | 36E | - | |
| 5 | AXX – 2 | -16 | 73W | 355 | 76W | 2 | |
| 6 | FKC – 33 | -18 | 48W | 330 | 51W | 28 | |
| 7 | FKC – 69 | -9 | 10E | 272 | 07E | 16 | |
| 8 | EKC – 29 | -8 | 34E | 248 | 31E | 10.5 | |
| 9 | CAI – 9 | -9 | 46E | 236 | 43E | 7.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.