Daily Sunspot Evaluation
Observation Sheet Saturday, 4 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)
- 13
- Number of spots (f)
- 56
- Relative number (R)
- 186
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810404.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 3 | 23 | 67W | 70 | 67W | 3 | |
| 2 | AXX – 2 | 18 | 36W | 39 | 36W | 1 | |
| 3 | CRO – 2 | 17 | 21W | 24 | 21W | 7.25 | |
| 4 | CAO – 7 | 14 | 18W | 21 | 18W | 8.5 | |
| 5 | DHC – 10 | 18 | 15E | 348 | 15E | 7 | |
| 6 | DAO – 6 | 7 | 32E | 331 | 32E | 6.25 | |
| 7 | HAX – 1 | 9 | 48E | 315 | 48E | 2.25 | |
| 8 | DAO – 6 | 8 | 59E | 304 | 59E | 4.75 | |
| 9 | AXX – 1 | 11 | 67E | 296 | 67E | ||
| 10 | ? – 9 | 19 | 74E | 289 | 74E | ||
| 11 | ARX – 1 | -11 | 67W | 70 | 67W | ||
| 12 | CRO – 3 | -2 | 11W | 14 | 11W | 4.25 | |
| 13 | BXO – 5 | -15 | 28E | 335 | 28E | 6 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.