Daily Sunspot Evaluation
Observation Sheet Wednesday, 31 July 1957
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)
- 6
- Number of spots (f)
- 57
- Relative number (R)
- 117
- Observer
- YÖ
- Reading
- all checks consistent
- File
- 19570731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 14 | 27 | 58E | ||||
| 2 | A – 1 | -2 | 13E | ||||
| 3 | C – 16 | -30 | 28E | ||||
| 4 | C – 5 | -28 | 12E | ||||
| 5 | H – 2 | -13 | 24E | ||||
| 6 | ? – 19 | 14 | 68E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.