Daily Sunspot Evaluation
Observation Sheet Sunday, 21 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)
- 9
- Number of spots (f)
- 46
- Relative number (R)
- 136
- Observer
- AK0
- Reading
- all checks consistent
- File
- 20020421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 3 | 7 | 18W | 80 | 17W | 2 | |
| 2 | DKI – 17 | 10 | 06W | 68 | 05W | 6.5 | |
| 3 | CSO – 6 | 5 | 49E | 13 | 50E | ~5 | |
| 4 | DAO – 5 | 11 | 60E | 2 | 61E | ~6 | |
| 5 | ? – 1 | -16 | 78W | 140 | 77W | ? | |
| 6 | AX – 1 | -5 | 53W | 115 | 52W | ||
| 7 | CSO – 6 | -20 | 26W | 88 | 25W | 11 | |
| 8 | AX – 2 | -12 | 16E | 46 | 17E | 1 | |
| 9 | ? – 5 | -16 | 75E | 347 | 76E | ? |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.