Daily Sunspot Evaluation
Observation Sheet Thursday, 21 February 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)
- 7
- Number of spots (f)
- 70
- Relative number (R)
- 140
- Observer
- ZFB
- Reading
- all checks consistent
- File
- 20020221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 5 | 4 | 10W | 132 | 11W | 3 | |
| 2 | AX – 1 | 3 | 34E | 88 | 33E | ||
| 3 | HK – 2 | 8 | 65E | 57 | 64E | ~3 | 93 |
| 4 | DAO – 7 | -10 | 67W | 189 | 68W | ~8 | |
| 5 | CAO – 44 | -20 | 12W | 134 | 13W | ~22 | |
| 6 | AX – 3 | -16 | 14E | 108 | 13E | ~1 | |
| 7 | BXO – 8 | -19 | 26E | 96 | 25E | 9 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.