Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 February 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)
- 5
- Number of spots (f)
- 15
- Relative number (R)
- 65
- Observer
- TÇ
- Reading
- all checks consistent
- File
- 20010220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 18 | 42W | 316 | 44W | ~2 | |
| 2 | CSO – 3 | -23 | 27W | 301 | 29W | ~4.5 | |
| 3 | DKC – 5 | -10 | 12W | 286 | 14W | 8 | |
| 4 | DRO – 3 | -24 | 13E | 261 | 11E | ~4 | |
| 5 | DRO – 3 | -8 | 29E | 245 | 27E | ~6.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.