Daily Sunspot Evaluation
Observation Sheet Friday, 18 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)
- 11
- Number of spots (f)
- 104
- Relative number (R)
- 214
- Observer
- ET
- Reading
- all checks consistent
- File
- 19571018.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 9 | 1E | ||||
| 2 | A – 2 | 12 | 7E | ||||
| 3 | J – 1 | -16 | 25E | ||||
| 4 | A – 1 | -22 | 36E | ||||
| 5 | A – 1 | -20 | 23E | ||||
| 6 | F – 64 | -24 | 5W | ||||
| 7 | E – 17 | -17 | 41W | ||||
| 8 | A – 1 | 22 | 62W | ||||
| 9 | C – 4 | 24 | 59W | ||||
| 10 | ? – 1 | 26 | 80W | ||||
| 11 | B – 10 | 26 | 10W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.