Daily Sunspot Evaluation
Observation Sheet Friday, 11 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)
- 20
- Number of spots (f)
- 179
- Relative number (R)
- 379
- Observer
- HM
- Reading
- all checks consistent
- File
- 19811211.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 1 | 21 | 71W | 0 | 73W | ||
| 2 | HKX – 6 | 4 | 67W | 356 | 69W | 4 | |
| 3 | DAO – 5 | 20 | 57W | 346 | 59W | 4.5 | |
| 4 | DKC – 35 | 18 | 35W | 324 | 37W | 13 | |
| 5 | EKI – 24 | 9 | 35W | 324 | 37W | 15.5 | |
| 6 | HSX – 1 | 12 | 20W | 309 | 22W | 2 | |
| 7 | HAX – 4 | 7 | 20W | 309 | 22W | 1.5 | |
| 8 | DAI – 12 | 10 | 01E | 288 | 01W | 8 | |
| 9 | HSX – 1 | 17 | 07E | 282 | 05E | 2 | |
| 10 | BXO – 5 | 8 | 10E | 279 | 08E | 4 | |
| 11 | HAX – 2 | -17 | 40W | 329 | 42W | 2.5 | |
| 12 | AXX – 2 | -30 | 37W | 326 | 39W | 1 | |
| 13 | AXX – 2 | -35 | 32W | 321 | 34W | 1 | |
| 14 | HKX – 8 | -18 | 28W | 317 | 30W | 3.5 | |
| 15 | HSX – 4 | -15 | 18W | 307 | 20W | 4 | |
| 16 | AXX – 2 | -19 | 12W | 301 | 14W | 1 | |
| 17 | DAI – 20 | -7 | 01E | 288 | 01W | 8 | |
| 18 | DKC – 23 | -15 | 15E | 274 | 13E | 8 | |
| 19 | CSI – 5 | -21 | 25E | 264 | 23E | 7 | |
| 20 | DKI – 17 | -7 | 32E | 257 | 30E | 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.