Daily Sunspot Evaluation
Observation Sheet Sunday, 17 February 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)
- 4
- Number of spots (f)
- 42
- Relative number (R)
- 82
- Observer
- AK
- Reading
- all checks consistent
- File
- 19520217.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 8 | 0.58 | 28 | |
| 2 | A – 2 | 0.85 | 84 | |
| 3 | E – 30 | 0.3 | 87 | |
| 4 | A – 2 | 0.11 | 244 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.