Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 December 1989
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)
- 50
- Relative number (R)
- 150
- Observer
- MB
- Reading
- all checks consistent
- File
- 19891212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HH – 1 | 19 | 78W | 307 | 80W | 4 | 424 |
| 2 | HA – 10 | 19 | 49W | 278 | 51W | 2.5 | 423 |
| 3 | CAO – 9 | 13 | 14W | 243 | 16W | 9 | 422 |
| 4 | BXI – 3 | 17 | 09W | 238 | 11W | 2.5 | 466 |
| 5 | BXI – 8 | 15 | 35E | 194 | 33E | 4 | 444 |
| 6 | AR – 1 | 27 | 80E | 149 | 78E | 1 | 457 |
| 7 | ? – 1 | 12 | 82E | 147 | 80E | 2 | 458 |
| 8 | BXO – 4 | -21 | 09E | 220 | 07E | 1 | 462 |
| 9 | CSO – 9 | -10 | 13E | 216 | 11E | 5 | 463 |
| 10 | CAO – 4 | -21 | 65E | 164 | 63E | 6.5 | 469 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.