Daily Sunspot Evaluation
Observation Sheet Sunday, 21 September 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)
- 5
- Number of spots (f)
- 9
- Relative number (R)
- 59
- Observer
- AK
- Reading
- all checks consistent
- File
- 19520921.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 3 | 0.34 | 97 | |
| 2 | A – 2 | 0.27 | 102 | |
| 3 | ? – 1 | 0.99 | 111 | |
| 4 | ? – 1 | 0.97 | 114 | |
| 5 | J – 2 | 0.7 | 142 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.