Daily Sunspot Evaluation
Observation Sheet Saturday, 17 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)
- 6
- Number of spots (f)
- 21
- Relative number (R)
- 81
- Observer
- TA
- Reading
- all checks consistent
- File
- 20010217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 3 | 15 | 75W | 29 | 77W | 10 | |
| 2 | HS – 1 | 28 | 22W | 336 | 24W | 1 | |
| 3 | HS – 1 | 18 | 00 | 314 | 02W | 1.5 | |
| 4 | AX – 2 | 19 | 59E | 255 | 57E | 2 | |
| 5 | AX – 3 | -23 | 12E | 302 | 10E | 1.5 | |
| 6 | CAI – 11 | -9 | 30E | 284 | 28E | 3.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.