Daily Sunspot Evaluation
Observation Sheet Monday, 9 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)
- 6
- Number of spots (f)
- 44
- Relative number (R)
- 104
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510409.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.91 | 49 | |
| 2 | C – 2 | 0.74 | 62 | |
| 3 | B – 3 | 0.49 | 73 | |
| 4 | C – 14 | 0.3 | 81 | |
| 5 | E – 23 | 0.7 | 270 | |
| 6 | A – 1 | 0.35 | 305 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.