Daily Sunspot Evaluation
Observation Sheet Friday, 11 April 1952
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)
- 3
- Number of spots (f)
- 21
- Relative number (R)
- 51
- Observer
- AK
- Reading
- all checks consistent
- File
- 19520411.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.96 | 249 | |
| 2 | D – 19 | 0.62 | 259 | |
| 3 | A – 1 | 0.96 | 264 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.