Daily Sunspot Evaluation
Observation Sheet Friday, 19 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)
- 3
- Number of spots (f)
- 12
- Relative number (R)
- 42
- Observer
- ET
- Reading
- all checks consistent
- File
- 19520919.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 10 | 0.7 | 106 | |
| 2 | J – 1 | 0.93 | 132 | |
| 3 | A – 1 | 0.53 | 241 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.