Daily Sunspot Evaluation
Observation Sheet Thursday, 17 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)
- 8
- Number of spots (f)
- 24
- Relative number (R)
- 104
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19811217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 19 | 69W | 279 | 72W | 2 | |
| 2 | BRI – 5 | 8 | 11W | 221 | 14W | 2.5 | |
| 3 | HAX – 2 | 11 | 08E | 202 | 05E | 1 | |
| 4 | BXO – 2 | -6 | 75W | 285 | 78W | 4 | |
| 5 | HKX – 6 | -14 | 63W | 273 | 66W | 6.5 | |
| 6 | HAX – 1 | -6 | 49W | 259 | 52W | 2 | |
| 7 | ARX – 4 | -8 | 32W | 242 | 35W | 1.75 | |
| 8 | AXX – 3 | -10 | 27E | 183 | 24E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.