Daily Sunspot Evaluation
Observation Sheet Friday, 20 April 2001
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)
- 7
- Number of spots (f)
- 62
- Relative number (R)
- 132
- Observer
- AK0
- Reading
- all checks consistent
- File
- 20010420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 5 | 19 | 28W | 245 | 31W | 6 | |
| 2 | HS – 2 | 9 | 09W | 226 | 12W | 2 | |
| 3 | CAI – 23 | 10 | 03E | 214 | 000 | 5.5 | |
| 4 | FKC – 20 | 17 | 64E | 153 | 61E | 25 | |
| 5 | AX – 2 | -15 | 17W | 234 | 20W | 0.5 | |
| 6 | AX – 3 | -11 | 23E | 194 | 20E | 1 | |
| 7 | DAI – 7 | -20 | 24E | 193 | 21E | 6 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.