Daily Sunspot Evaluation
Observation Sheet Thursday, 30 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)
- 26
- Relative number (R)
- 126
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810430.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARX – 1 | 5 | 73W | 95 | 76W | 1 | |
| 2 | HRX – 3 | 16 | 08W | 30 | 11W | 1.5 | |
| 3 | AXX – 1 | 26 | 05W | 27 | 08W | 0.5 | |
| 4 | CAI – 8 | 4 | 03E | 19 | 00 | 5 | |
| 5 | AXX – 1 | 4 | 39E | 343 | 36E | ||
| 6 | HSX – 1 | 20 | 42E | 340 | 39E | 1.5 | |
| 7 | HAX – 1 | 7 | 63E | 319 | 60E | 1 | |
| 8 | DAO – 3 | 16 | 71E | 311 | 68E | 5.5 | |
| 9 | ? – 2 | 5 | 79E | 303 | 76E | ||
| 10 | CAI – 5 | -8 | 50E | 332 | 47E | 5.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.