Daily Sunspot Evaluation
Observation Sheet Monday, 21 April 2003
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)
- 5
- Number of spots (f)
- 31
- Relative number (R)
- 81
- Observer
- —
- Reading
- all checks consistent
- File
- 20030421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 8 | 15 | 49W | 338 | 52W | 9 | 91 |
| 2 | DAI – 8 | 17 | 02E | 287 | 01W | 7.5 | 92 |
| 3 | HS – 3 | 12 | 32E | 257 | 29E | 3 | 93 |
| 4 | HR – 1 | -8 | 69W | 358 | 72W | 7 | 89 |
| 5 | HK – 11 | -14 | 52E | 237 | 49E | 8 | 94 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.