Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 October 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)
- 6
- Number of spots (f)
- 75
- Relative number (R)
- 135
- Observer
- GT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19811013.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HHX – 2 | 19 | 18E | 330 | 15E | 3 | |
| 2 | HAX – 2 | -10 | 7W | 59 ⚠ | 7W | 2 | |
| 3 | DAO – 5 | -17 | 12W | 360 | 15W | 11.5 | |
| 4 | FKC – 55 | -19 | 13E | 335 | 10E | 18.5 | |
| 5 | CAO – 4 | -20 | 29E | 319 | 26E | 8 | |
| 6 | EKC – 7 | -11 | 75E | 273 | 72E | 12 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.