Daily Sunspot Evaluation
Observation Sheet Thursday, 12 April 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)
- 7
- Number of spots (f)
- 37
- Relative number (R)
- 107
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510412.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | ? – 2 | 0.99 | 50 | |
| 2 | A – 2 | 0.91 | 67 | |
| 3 | A – 6 | 0.97 | 70 | |
| 4 | A – 7 | 0.22 | 220 | |
| 5 | C – 15 | 0.4 | 233 | |
| 6 | A – 4 | 0.82 | 237 | |
| 7 | ? – 1 | 0.97 | 259 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.