Daily Sunspot Evaluation
Observation Sheet Saturday, 13 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)
- 4
- Number of spots (f)
- 24
- Relative number (R)
- 64
- Observer
- HE
- Reading
- all checks consistent
- File
- 19971213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 25 | 60W | 228 | 61W | - | 108 |
| 2 | CAO – 7 | 31 | 56W | 224 | 57W | 9 | 109 |
| 3 | EAO – 15 | 30 | 23W | 191 | 24W | 11 | 110 |
| 4 | NS – 1 | -40 | 19W | 187 | 20W | 1 | 111 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.