Daily Sunspot Evaluation
Observation Sheet Sunday, 26 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)
- 36
- Relative number (R)
- 96
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810426.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HKI – 6 | 15 | 75W | 150 | 78W | 105 | |
| 2 | ? – 1 | 23 | 66W | 141 | 69W | 15 | |
| 3 | CAO – 3 | 17 | 20W | 95 | 23W | 4 | |
| 4 | DAO – 9 | 15 | 46E | 29 | 43E | 8 | |
| 5 | FAI – 16 | 2 | 51E | 24 | 48E | 18 | |
| 6 | ? – 1 | -10 | 74W | 149 | 77W | 15 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.