Daily Sunspot Evaluation
Observation Sheet Saturday, 25 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)
- 9
- Number of spots (f)
- 57
- Relative number (R)
- 147
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810425.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 9 | 71W | 160 | 74W | 1 | |
| 2 | HKI – 13 | 15 | 60W | 149 | 63W | 8E | |
| 3 | CAI – 5 | 24 | 53W | 142 | 56W | 5.5 | |
| 4 | CAO – 4 | 17 | 07W | 96 | 10W | 4 | |
| 5 | CAO – 6 | 11 | 24E | 65 | 21E | 3.5 | |
| 6 | DAO – 10 | 15 | 61E | 28 | 58E | 10 | |
| 7 | DAI – 15 | 1 | 68E | 21 | 65E | 16E | |
| 8 | HAX – 1 | -10 | 59W | 148 | 62W | 2 | |
| 9 | AXX – 2 | -16 | 44W | 133 | 47W | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.