Daily Sunspot Evaluation
Observation Sheet Monday, 12 September 1955
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)
- 15
- Relative number (R)
- 55
- Observer
- AK
- Reading
- all checks consistent
- File
- 19550912.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.37 | 7 | |
| 2 | D – 9 | 0.63 | 86 | |
| 3 | A – 1 | 0.62 | 226 | |
| 4 | H – 4 | 0.86 | 322 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.