Daily Sunspot Evaluation
Observation Sheet Saturday, 19 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)
- 10
- Number of spots (f)
- 109
- Relative number (R)
- 209
- Observer
- OG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810919.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKI – 16 | 15 | 38W | 843 ⚠ | 41W | 125 | |
| 2 | HKI – 11 | 19 | 34W | 339 | 37W | 7 | |
| 3 | CAI – 7 | 19 | 21W | 326 | 24W | 6 | |
| 4 | BXO – 6 | 13 | 04W | 309 | 07W | 55 | |
| 5 | HSX – 1 | 9 | 13E | 292 | 10E | 2 | |
| 6 | EKC – 31 | 9 | 41E | 264 | 38E | 18 | |
| 7 | BRI – 13 | -5 | 08W | 313 | 11W | 6 | |
| 8 | AXX – 4 | -8 | 01E | 304 | 02W | 9 | |
| 9 | BXO – 5 | -9 | 16E | 289 | 13E | 6 | |
| 10 | DKI – 15 | -8 | 53E | 252 | 50E | 8 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.