Daily Sunspot Evaluation
Observation Sheet Friday, 10 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)
- 10
- Number of spots (f)
- 114
- Relative number (R)
- 214
- Observer
- TÖ
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810410.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 18 | 60W | 347 | 63W | 225 | |
| 2 | DAC – 20 | 5 | 50W | 337 | 53W | 5.5 | |
| 3 | BRO – 2 | 8 | 36W | 323 | 39W | 25 | |
| 4 | DAC – 18 | 9 | 30W | 317 | 33W | 11 | |
| 5 | EAC – 29 | 8 | 17W | 304 | 20W | 15 | |
| 6 | EKC – 23 | 19 | 02W | 219 ⚠ | 05W | 16.5 | |
| 7 | HAX – 1 | 21 | 31E | 248 ⚠ | 36E | 1 | |
| 8 | EKC – 15 | 15 | 54E | 233 | 51E | 15 | |
| 9 | DAO – 4 | 10 | 71E | 216 | 68E | 5 | |
| 10 | AXX – 1 | -4 | 69E | 218 | 66E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.