Daily Sunspot Evaluation
Observation Sheet Thursday, 11 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)
- 10
- Number of spots (f)
- 20
- Relative number (R)
- 120
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570711.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 34 | 11E | ||||
| 2 | C – 2 | 9 | 40E | ||||
| 3 | ? – 1 | -17 | 80E | ||||
| 4 | A – 2 | -12 | 22E | ||||
| 5 | G – 2 | -32 | 41E | ||||
| 6 | G – 3 | -11 | 14W | ||||
| 7 | A – 3 | -13 | 19W | ||||
| 8 | ? – 2 | -30 | 85W | ||||
| 9 | A – 2 | 12 | 50W | ||||
| 10 | ? – 1 | 25 | 79W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.