Daily Sunspot Evaluation
Observation Sheet Friday, 12 January 1951
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)
- 6
- Number of spots (f)
- 20
- Relative number (R)
- 80
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510112.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 2 | 0.24 | 135 | |
| 2 | A – 1 | 0.13 | 198 | |
| 3 | ? – 2 | 0.39 | 254 | |
| 4 | B – 6 | 0.6 | 258 | |
| 5 | C – 8 | 0.68 | 299 | |
| 6 | A – 1 | 0.28 | 348 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.