Daily Sunspot Evaluation
Observation Sheet Friday, 11 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)
- 107
- Relative number (R)
- 197
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19800411.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FAO – 11 | 13 | 57W | 104 | 56W | 14 | |
| 2 | AKX – 1 | 20 | 72E | 335 | 73E | 1 | |
| 3 | FKC – 33 | 24 | 39W | 86 | 38W | 21 | |
| 4 | AKX – 3 | 9 | 45E | 2 | 46E | 05 | |
| 5 | ? – 2 | -31 | 80W | 127 | 79W | 6 | |
| 6 | HKX – 12 | -19 | 08E | 39 | 09E | 4 | |
| 7 | HKX – 3 | -29 | 20E | 27 | 21E | 3 | |
| 8 | FKC – 25 | -32 | 32E | 15 | 33E | 14 | |
| 9 | ELI – 17 | -8 | 34E | 13 | 35E | 115 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.