Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 December 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)
- 44
- Relative number (R)
- 124
- Observer
- HE
- Reading
- counts consistent, some coordinates doubtful
- File
- 19911218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKI – 7 | 9 | 73W | 307 | 74W | 14.5 | 670 |
| 2 | AX – 1 | 4 | 62W | 296 | 63W | - | 663 |
| 3 | BRI – 5 | 21 | 62W | 286 ⚠ | 53W | 6 | 671 |
| 4 | DAO – 6 | -17 | 35W | 269 | 36W | 8.5 | 681 |
| 5 | CKO – 9 | -5 | 34W | 268 | 35W | 9.5 | 678 |
| 6 | CAO – 3 | -18 | 15W | 249 | 16W | 5.5 | 679 |
| 7 | ESI – 12 | -11 | 44E | 190 | 43E | 15 | 680 |
| 8 | ? – 1 | -22 | 83E | 151 | 82E | - | 684 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.