Daily Sunspot Evaluation
Observation Sheet Wednesday, 31 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)
- 30
- Relative number (R)
- 60
- Observer
- TÇ
- Reading
- all checks consistent
- File
- 19971231.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 7 | -22 | 57W | 348 | 59W | 10 | 112, 113 |
| 2 | HK – 11 | 21 | 16W | 307 | 18W | 4 | 116, 115 |
| 3 | DRO – 12 | -29 | 12E | 279 | 10E | 8 | 118, 1101 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.