Daily Sunspot Evaluation
Observation Sheet Friday, 3 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)
- 33
- Relative number (R)
- 123
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810403.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 8 | 13 | 06W | 22 | 06W | 4.5 | |
| 2 | CAO – 7 | 27 | 06W | 22 | 06W | 8.5 | |
| 3 | DHI – 6 | 18 | 29E | 347 | 29E | 5.5 | |
| 4 | CAO – 4 | 7 | 46E | 330 | 46E | 4.5 | |
| 5 | HAX – 1 | 9 | 62E | 314 | 62E | 1.5 | |
| 6 | HAX – 1 | 8 | 72E | 304 | 72E | 2 | |
| 7 | ? – 4 | -44 | 81W | 97 | 81W | - | |
| 8 | HAX – 1 | -11 | 54W | 70 | 54W | 2 | |
| 9 | HAX – 1 | -3 | 04E | 12 | 04E | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.