Daily Sunspot Evaluation
Observation Sheet Thursday, 15 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)
- 35
- Relative number (R)
- 75
- Observer
- KA
- Reading
- all checks consistent
- File
- 19550915.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | D – 21 | 0.28 | 15 | |
| 2 | A – 1 | 0.36 | 42 | |
| 3 | B – 11 | 0.55 | 216 | |
| 4 | A – 2 | 1.32 | 328 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.