Daily Sunspot Evaluation
Observation Sheet Friday, 24 April 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)
- 43
- Relative number (R)
- 103
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810424.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARX – 1 | -109 | 57W | 158 | 60W | 0.5 | |
| 2 | HKI – 26 | 15 | 47W | 148 | 50W | 7.5 | |
| 3 | CAI – 4 | 25 | 40W | 141 | 43W | 3.5 | |
| 4 | DAO – 5 | 15 | 72E | 29 | 69E | 8.5 | |
| 5 | ? – 5 | 1 | 79E | 20 | 76E | ||
| 6 | HAX – 2 | -10 | 46W | 147 | 49W | 2.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.