Daily Sunspot Evaluation
Observation Sheet Friday, 18 October 1991
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)
- 8
- Number of spots (f)
- 52
- Relative number (R)
- 132
- Observer
- TK
- Reading
- all checks consistent
- File
- 19911018.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 6 | 57W | 16 | 59W | 0.2 | 565 |
| 2 | BXO – 4 | 16 | 43W | 2 | 45W | 3.5 | 568 |
| 3 | AX – 2 | 13 | 08W | 327 | 10W | 0.5 | 584 |
| 4 | FAO – 15 | 23 | 22E | 297 | 20E | 15.5 | 575 |
| 5 | DKI – 12 | -23 | 48W | 7 | 50W | 6 | 562 |
| 6 | DAO – 7 | -3 | 21W | 340 | 23W | 7 | 583 |
| 7 | CAI – 7 | -22 | 14W | 333 | 16W | 11.5 | 571 |
| 8 | BXO – 4 | -37 | 07W | 326 | 09W | 3.5 | 585 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.