Daily Sunspot Evaluation
Observation Sheet Friday, 21 September 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)
- 13
- Number of spots (f)
- 150
- Relative number (R)
- 280
- Observer
- SB0
- Reading
- all checks consistent
- File
- 20010921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 17 | 69W | 50 | 72W | ||
| 2 | DRI – 14 | 7 | 19W | 360 | 22W | ~5 | |
| 3 | DAI – 16 | 12 | 08W | 349 | 11W | ~7 | |
| 4 | AX – 1 | 21 | 01E | 340 | 02W | ||
| 5 | HS – 7 | 25 | 09E | 332 | 06E | 2.5 | |
| 6 | DAO – 13 | 12 | 15E | 326 | 12E | ~7 | |
| 7 | CSI – 7 | 25 | 21E | 320 | 18E | ~5 | |
| 8 | HS – 1 | 2 | 24E | 317 | 21E | ~2 | |
| 9 | HS – 5 | 3 | 41E | 300 | 38E | ~3 | |
| 10 | HS – 4 | -11 | 50W | 31 | 53W | 3 | |
| 11 | CSO – 7 | -12 | 34W | 15 | 37W | ~4 | |
| 12 | FKC – 62 | -18 | 49E | 292 | 46E | ~17 | |
| 13 | DKC – 11 | -18 | 69E | 272 | 66E | ~9 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.