Daily Sunspot Evaluation
Observation Sheet Thursday, 25 April 2002
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)
- 16
- Number of spots (f)
- 82
- Relative number (R)
- 242
- Observer
- AK0
- Reading
- all checks consistent
- File
- 20020425.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HR – 1 | 7 | 69W | 67 | 70W | ~0.5 | |
| 2 | HK – 4 | 11 | 60W | 58 | 61W | ~6 | |
| 3 | DAO – 12 | 3 | 03W | 1 | 04W | 9.5 | |
| 4 | CAI – 9 | 10 | 07E | 351 | 06E | 6 | |
| 5 | BXO – 5 | 4 | 22E | 336 | 21E | ~3.5 | |
| 6 | BXO – 3 | 21 | 35E | 323 | 34E | 6 | |
| 7 | HS – 4 | 12 | 47E | 311 | 46E | 4 | |
| 8 | HS – 2 | 12 | 59E | 299 | 58E | 2 | |
| 9 | ? – 1 | -22 | 80W | 79 | 81W | ? | |
| 10 | BXI – 6 | -15 | 50W | 48 | 51W | ~5 | |
| 11 | CAI – 8 | -3 | 38W | 36 | 39W | ~6 | |
| 12 | BXI – 7 | -14 | 28W | 26 | 29W | 4 | |
| 13 | BXO – 6 | -17 | 13W | 11 | 14W | ~8 | |
| 14 | AX – 2 | -1 | 08E | 350 | 07E | 1 | |
| 15 | AX – 4 | -29 | 13E | 345 | 12E | 1 | |
| 16 | BXO – 8 | -18 | 28E | 330 | 27E | 8 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.