Daily Sunspot Evaluation
Observation Sheet Wednesday, 11 September 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)
- 8
- Number of spots (f)
- 120
- Relative number (R)
- 200
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570911.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | ? – 2 | 15 | 79 | |
| 2 | J – 3 | -21 | 38 | |
| 3 | D – 9 | -45 | 41 | |
| 4 | E – 22 | -16 | 4 | |
| 5 | D – 20 | -13 | 9 | |
| 6 | E – 18 | -24 | 55 | |
| 7 | D – 16 | -8 | 26 | |
| 8 | E – 30 | 12 | 6 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.