Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 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)
- 11
- Number of spots (f)
- 85
- Relative number (R)
- 195
- Observer
- YÖ
- Reading
- all checks consistent
- File
- 19570717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 11 | 16E | ||||
| 2 | C – 7 | 14 | 25E | ||||
| 3 | E – 21 | 24 | 45E | ||||
| 4 | C – 4 | 32 | 65E | ||||
| 5 | B – 12 | -9 | 35E | ||||
| 6 | ? – 2 | -23 | 72E | ||||
| 7 | A – 3 | -33 | 64E | ||||
| 8 | H – 7 | -36 | 24E | ||||
| 9 | H – 5 | -15 | 20W | ||||
| 10 | F – 21 | -32 | 34W | ||||
| 11 | A – 1 | 34 | 62W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.