Daily Sunspot Evaluation
Observation Sheet Thursday, 20 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)
- 15
- Number of spots (f)
- 120
- Relative number (R)
- 270
- Observer
- ıH
- Reading
- all checks consistent
- File
- 20010920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HR – 3 | 18 | 57W | 51 | 60W | 2 | |
| 2 | HA – 3 | 28 | 27W | 21 | 30W | 1.5 | |
| 3 | DAO – 13 | 7 | 05W | 359 | 08W | 4 | |
| 4 | DAC – 17 | 13 | 05E | 349 | 02E | 4.5 | |
| 5 | HS – 1 | 21 | 14E | 340 | 11E | 0.5 | |
| 6 | HA – 6 | 24 | 22E | 332 | 19E | 2.3 | |
| 7 | DKC – 16 | 13 | 28E | 326 | 25E | 8.5 | |
| 8 | DAC – 12 | 25 | 34E | 320 | 31E | 6 | |
| 9 | HS – 1 | 2 | 38E | 316 | 35W | 2.2 | |
| 10 | HA – 3 | 3 | 54E | 300 | 51E | 1 | |
| 11 | HS – 2 | -11 | 36W | 30 | 39W | 2 | |
| 12 | HR – 3 | -29 | 27W | 21 | 30W | 0.5 | |
| 13 | HS – 12 | -11 | 22W | 16 | 25W | 0.4 | |
| 14 | FKC – 27 | -18 | 63E | 291 | 60E | 18.5 | |
| 15 | ? – 1 | -18 | 80E | 274 | 77E | ? |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.