Daily Sunspot Evaluation
Observation Sheet Saturday, 17 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)
- 10
- Number of spots (f)
- 202
- Relative number (R)
- 302
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19811017.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HKX – 1 | 19 | 35W | 329 | 37W | 3 | |
| 2 | CAI – 6 | 14 | 33W | 327 | 35W | 6 | |
| 3 | HAX – 1 | -16 | 74W | 8 | 76W | 2 | |
| 4 | AXX – 6 | -16 | 60W | 354 | 62W | 4 | |
| 5 | FKC – 73 | -18 | 36W | 330 | 38W | 265 | |
| 6 | AXX – 2 | -20 | 08W | 302 | 10W | 1 | |
| 7 | FKC – 77 | -10 | 22E | 272 | 20E | 16 | |
| 8 | AXX – 1 | -19 | 43E | 251 | 41E | - | |
| 9 | DKC – 29 | -8 | 47E | 247 | 45E | 10 | |
| 10 | DAI – 6 | -10 | 60E | 234 | 58E | 9 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.