Daily Sunspot Evaluation
Observation Sheet Saturday, 31 March 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)
- 4
- Number of spots (f)
- 16
- Relative number (R)
- 56
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510331.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 6 | 0.84 | 79 | |
| 2 | A – 2 | 0.2 | 205 | |
| 3 | C – 4 | 0.66 | 263 | |
| 4 | A – 4 | 0.27 | 314 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.