Daily Sunspot Evaluation
Observation Sheet Sunday, 22 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)
- 84
- Relative number (R)
- 154
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510422.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 13 | 0.84 | 39 | |
| 2 | C – 3 | 0.48 | 76 | |
| 3 | C – 6 | 0.54 | 83 | |
| 4 | A – 1 | 0.78 | 235 | |
| 5 | J – 1 | 0.95 | 240 | |
| 6 | F – 56 | 0.78 | 265 | |
| 7 | B – 4 | 0.27 | 330 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.