Daily Sunspot Evaluation
Observation Sheet Sunday, 23 September 1951
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)
- 8
- Number of spots (f)
- 61
- Relative number (R)
- 141
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510923.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 12 | 0.04 | 90 | |
| 2 | A – 6 | 0.2 | 103 | |
| 3 | A – 2 | 0.3 | 104 | |
| 4 | A – 1 | 0.94 | 110 | |
| 5 | ? – 1 | 0.96 | 286 | |
| 6 | C – 8 | 0.16 | 302 | |
| 7 | E – 18 | 0.67 | 306 | |
| 8 | G – 13 | 0.22 | 345 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.