Daily Sunspot Evaluation
Observation Sheet Saturday, 20 December 1997
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
- 19971220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSI – 9 | 17 | 11W | 88 | 13W | 10 | 112 41 |
| 2 | AX – 1 | -25 | 57W | 134 | 59W | - | 113 42 |
| 3 | ? – 1 | -21 | 87E | 350 | 85E | - | 114 43 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.