Daily Sunspot Evaluation
Observation Sheet Thursday, 25 April 1991
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)
- 3
- Number of spots (f)
- 11
- Relative number (R)
- 41
- Observer
- YK
- Reading
- all checks consistent
- File
- 19910425.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 3 | -22 | 70W | 197 | 73W | 1 | 190 |
| 2 | HA – 1 | -11 | 64W | 191 | 67W | 2 | 174 |
| 3 | BXI – 7 | -30 | 14W | 141 | 17W | 4.5 | 191 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.