Daily Sunspot Evaluation
Observation Sheet Wednesday, 12 December 1990
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)
- 72
- Relative number (R)
- 162
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19901212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 11 | 15 | 75W | 166 | 76W | 15 | 559 |
| 2 | CAI – 8 | 22 | 73W | 164 | 74W | 9 | 558 |
| 3 | BXO – 8 | 20 | 58W | 149 | 59W | 10 | 560 |
| 4 | CKI – 15 | 9 | 53W | 144 | 54W | 11 | 561 |
| 5 | HA – 2 | 28 | 37E | 54 | 36E | 1.5 | 569 |
| 6 | CKI – 20 | 4 | 40E | 51 | 39E | 11 | 570 |
| 7 | HA – 1 | 22 | 60E | 31 | 59E | 1.5 | 573 |
| 8 | FKO – 5 | 18 | 74E | 17 | 73E | 21 | 575 |
| 9 | HA – 2 | -18 | 49W | 140 | 48W | 2 | 566 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.