Daily Sunspot Evaluation
Observation Sheet Wednesday, 31 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)
- 5
- Number of spots (f)
- 67
- Relative number (R)
- 117
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510131.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.54 | 7 | |
| 2 | A – 4 | 0.82 | 248 | |
| 3 | J – 2 | 0.7 | 255 | |
| 4 | C – 16 | 0.71 | 277 | |
| 5 | F – 44 | 0.48 | 286 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.