Daily Sunspot Evaluation
Observation Sheet Wednesday, 11 July 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)
- 4
- Number of spots (f)
- 51
- Relative number (R)
- 91
- Observer
- MH
- Reading
- all checks consistent
- File
- 19510711.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 10 | 0.43 | 76 | |
| 2 | E – 39 | 0.69 | 109 | |
| 3 | A – 1 | 0.26 | 273 | |
| 4 | J – 1 | 0.51 | 291 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.