Daily Sunspot Evaluation
Observation Sheet Thursday, 10 April 1980
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)
- 146
- Relative number (R)
- 236
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19800410.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKI – 26 | 12 | 40W | 104 | 43W | 15 | |
| 2 | FKI – 67 | 24 | 22W | 86 | 25W | 20 | |
| 3 | AKK – 1 | 18 | 15E | 47 | 12E | ||
| 4 | HSK – 2 | 9 | 61E | 3 | 58E | 2 | |
| 5 | AKK – 1 | -9 | 74W | 138 | 77W | ||
| 6 | HKX – 6 | -20 | 25E | 39 | 22E | 3 | |
| 7 | HKX – 9 | -29 | 38E | 26 | 35E | 6 | |
| 8 | DAI – 10 | -32 | 50E | 14 | 47E | 8 | |
| 9 | FKI – 24 | -8 | 51E | 13 | 48E | 11 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.