Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 February 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)
- 49
- Relative number (R)
- 119
- Observer
- SB0
- Reading
- all checks consistent
- File
- 20010221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 17 | 54W | 316 | 57W | 1 | |
| 2 | DSO – 4 | 12 | 72E | 190 | 69E | 6 | |
| 3 | DSO – 5 | -25 | 40W | 302 | 43W | 6 | |
| 4 | DKI – 21 | -9 | 23W | 285 | 26W | 8 | |
| 5 | CSO – 5 | -26 | 05E | 257 | 02E | 7.5 | |
| 6 | CSO – 12 | -8 | 16E | 246 | 13E | 6.5 | |
| 7 | HS – 1 | -10 | 67E | 195 | 64E | 1.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.