Daily Sunspot Evaluation
Observation Sheet Monday, 21 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)
- 15
- Number of spots (f)
- 79
- Relative number (R)
- 229
- Observer
- AÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKO – 6 | 15 | 64W | 342 | 67W | 13 | |
| 2 | HKX – 4 | 19 | 61W | 339 | 64W | 3 | |
| 3 | OKT – 12 | 19 | 49W | 327 | 52W | 10 | |
| 4 | HSX – 1 | 10 | 14W | 292 | 17W | 2 | |
| 5 | DAI – 13 | 10 | 07E | 241 ⚠ | 04E | 6.5 | FKI 22 |
| 6 | OKT – 19 | 11 | 19E | 259 | 16E | 8.5 | |
| 7 | AXX – 1 | 16 | 44E | 204 ⚠ | 41E | - | |
| 8 | AXX – 4 | -19 | 49W | 327 | 52W | 2.5 | |
| 9 | AXX – 4 | -16 | 28W | 306 | 31W | - | |
| 10 | AXX – 1 | -24 | 23W | 301 | 26W | - | |
| 11 | BXO – 6 | -10 | 08W | 286 | 11W | 3.5 | |
| 12 | AXX – 1 | -22 | 06E | 242 ⚠ | 03E | - | |
| 13 | DKO – 4 | -8 | 26E | 252 | 23E | 6 | |
| 14 | AXX – 1 | -9 | 69E | 209 | 66E | - | |
| 15 | ? – 2 | -11 | 82E | 196 | 79E | 3 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.