Daily Sunspot Evaluation
Observation Sheet Monday, 6 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)
- 92
- Relative number (R)
- 182
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810406.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CRO – 7 | 13 | 41W | 21 | 44W | 6.75 | |
| 2 | CHO – 9 | 17 | 07W | 347 | 10W | 8.75 | |
| 3 | DEC – 16 | 5 | 07E | 333 | 04E | 7 | |
| 4 | HSX – 1 | 9 | 25E | 315 | 22E | 2 | |
| 5 | DKI – 28 | 8 | 38E | 302 | 35E | 12.5 | |
| 6 | AAA – 1 | 12 | 45E | 295 | 41E | - | |
| 7 | EKC – 28 | 19 | 53E | 287 | 50E | 17 | |
| 8 | AAA – 1 | -18 | 15E | 325 | 12E | - | |
| 9 | AAA – 1 | -8 | 68E | 272 | 65E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.