Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 April 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)
- 16
- Relative number (R)
- 66
- Observer
- AK0
- Reading
- all checks consistent
- File
- 20010417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 6 | 29W | 269 | 28W | 2 | |
| 2 | HS – 4 | 18 | 30E | 210 | 31E | 4 | |
| 3 | HA – 3 | 17 | 41E | 199 | 42E | 2 | |
| 4 | HA – 3 | -9 | 37W | 277 | 36W | 2 | |
| 5 | CSI – 4 | -3 | 55E | 185 | 56E | 6 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.