Daily Sunspot Evaluation
Observation Sheet Thursday, 17 October 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)
- 13
- Number of spots (f)
- 121
- Relative number (R)
- 251
- Observer
- FY
- Reading
- all checks consistent
- File
- 19571017.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 16 | 26 | 4E | ||||
| 2 | B – 8 | 10 | 19E | ||||
| 3 | A – 1 | -24 | 61E | ||||
| 4 | A – 1 | -16 | 40E | ||||
| 5 | A – 1 | -21 | 38E | ||||
| 6 | F – 50 | -25 | 8E | ||||
| 7 | C – 27 | -17 | 28W | ||||
| 8 | B – 3 | 10 | 10W | ||||
| 9 | ? – 1 | 19 | 88W | ||||
| 10 | B – 4 | 23 | 47W | ||||
| 11 | H – 2 | 26 | 65W | ||||
| 12 | B – 2 | 26 | 35W | ||||
| 13 | B – 5 | 22 | 13W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.