Daily Sunspot Evaluation
Observation Sheet Tuesday, 11 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)
- 50
- Relative number (R)
- 130
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510911.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 4 | 0.61 | 94 | |
| 2 | D – 28 | 0.7 | 110 | |
| 3 | ? – 2 | 0.94 | 131 | |
| 4 | J – 1 | 0.23 | 132 | |
| 5 | B – 8 | 0.22 | 233 | |
| 6 | A – 3 | 0.49 | 257 | |
| 7 | J – 1 | 0.4 | 263 | |
| 8 | C – 3 | 0.95 | 283 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.