Daily Sunspot Evaluation
Observation Sheet Sunday, 13 December 1981
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)
- 14
- Number of spots (f)
- 69
- Relative number (R)
- 209
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19811213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKO – 11 | 9 | 62W | 325 | 64W | 16 | |
| 2 | DAC – 9 | 19 | 61W | 324 | 63W | 10.5 | |
| 3 | HSX – 1 | 6 | 46W | 309 | 48W | 1 | |
| 4 | HSX – 1 | 12 | 46W | 309 | 48W | 1.25 | |
| 5 | DAO – 3 | 11 | 25W | 288 | 27W | 8.5 | |
| 6 | HAX – 1 | 18 | 19W | 282 | 21W | 1.5 | |
| 7 | BBI – 5 | 9 | 63E | 200 | 61E | 7 | |
| 8 | ARX – 2 | -17 | 67W | 330 | 69W | 2 | |
| 9 | ARX – 3 | -18 | 56W | 319 | 58W | 2 | |
| 10 | HAX – 1 | -14 | 46W | 309 | 48W | 2 | |
| 11 | DAC – 15 | -8 | 26W | 289 | 28W | 11.5 | |
| 12 | DISC – 9 | -15 | 11W | 274 | 13W | 7 | |
| 13 | HAX – 1 | -20 | 05W | 268 | 07W | 1 | |
| 14 | CAI – 7 | -8 | 05E | 258 | 03E | 6.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.