Daily Sunspot Evaluation
Observation Sheet Wednesday, 16 September 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)
- 13
- Number of spots (f)
- 67
- Relative number (R)
- 197
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810916.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKC – 5 | 9 | 78W | 62 | 81W | 12 | |
| 2 | DKI – 14 | 15 | 02E | 342 | 01W | 10 | |
| 3 | EDKI – 19 | 19 | 06E | 338 | 03E | 7.5 | |
| 4 | HAX – 2 | 9 | 53E | 291 | 50E | 2 | |
| 5 | CAO – 5 | 8 | 78E | 266 | 75E | 10 | |
| 6 | AXX – 1 | -9 | 64W | 48 | 67E | - | |
| 7 | AXX – 2 | 17 | 49W | 33 | 52W | - | |
| 8 | AXX – 2 | 17 | 15W | 359 | 18W | 2 | |
| 9 | CAI – 4 | 6 | 21E | 823 ⚠ | 18E | 4 | |
| 10 | ARX – 2 | 17 | 28E | 822 ⚠ | 19E | - | |
| 11 | AXX – 3 | -14 | 30E | 814 ⚠ | 27E | - | |
| 12 | EHAX – 1 | -16 | 34E | 310 | 31E | - | |
| 13 | DAO – 7 | -8 | 57E | 287 | 54E | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.