Daily Sunspot Evaluation
Observation Sheet Sunday, 15 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)
- 10
- Number of spots (f)
- 93
- Relative number (R)
- 193
- Observer
- YK
- Reading
- counts consistent, some coordinates doubtful
- File
- 19911215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKC – 52 | 4 | 32W | 306 | 34W | 15 | 670 |
| 2 | AX – 2 | 20 | 12W | 286 | 14W | 2.5 | 671 |
| 3 | ? – 1 | -11 | 87W | 1 | 89W | - | 672 |
| 4 | CAI – 11 | -18 | 68W | 342 | 70W | 18 | 668 |
| 5 | AX – 1 | -26 | 62W | 236 ⚠ | 64W | - | 673 E |
| 6 | AX – 3 | -30 | 53W | 227 ⚠ | 55W | 10 | 675 |
| 7 | BRO – 4 | -18 | 06E | 268 | 04E | 4 | 681 E |
| 8 | CHI – 13 | -5 | 08E | 266 | 06E | 10.5 | 678 |
| 9 | HA – 5 | -17 | 22E | 252 | 20E | 1.5 | 679 |
| 10 | ? – 1 | -11 | 81E | 193 | 79E | - | 680 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.