Daily Sunspot Evaluation
Observation Sheet Sunday, 20 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)
- 11
- Number of spots (f)
- 87
- Relative number (R)
- 197
- Observer
- OG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKO – 16 | 16 | 52W | 343 | 55W | 125 | |
| 2 | HKX – 2 | 18 | 49W | 840 ⚠ | 52W | 3 | |
| 3 | CAR – 12 | 19 | 35W | 326 | 38W | 8.7 | |
| 4 | AXX – 2 | 13 | 21W | 312 | 24W | - | |
| 5 | HAX – 1 | 9 | 01W | 282 ⚠ | 04W | 2 | |
| 6 | FKI – 29 | 9 | 27E | 264 | 24E | 1 | |
| 7 | BXI – 6 | -6 | 22W | 313 | 25W | 6 | |
| 8 | AXX – 2 | -21 | 11W | 302 | 14W | 1 | |
| 9 | BXI – 8 | -10 | 03E | 298 ⚠ | 00 | 7 | |
| 10 | AXX – 3 | -14 | 11E | 280 | 08E | 6 | |
| 11 | OKO – 6 | -8 | 40E | 251 | 37E | 6 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.