Daily Sunspot Evaluation
Observation Sheet Friday, 12 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)
- 5
- Number of spots (f)
- 30
- Relative number (R)
- 80
- Observer
- HÇ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19971212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 2 | 26 | 30W | 252 ⚠ | 72W | 7 | 107 108 |
| 2 | HR – 1 | 26 | 46W | 228 | 48W | 0.5 | 107 108 |
| 3 | DAO – 10 | 32 | 42W | 224 | 44W | 8 | 109 108 |
| 4 | DAC – 16 | 30 | 44W | 193 ⚠ | 13W | 8.5 | 110 109 |
| 5 | HS – 1 | -39 | 07W | 189 | 09W | 2 | 111 110 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.