Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 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)
- 167
- Relative number (R)
- 297
- Observer
- ET
- Reading
- all checks consistent
- File
- 19571015.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 3 | 0 | ||||
| 2 | A – 1 | 31 | 9E | ||||
| 3 | B – 9 | 23 | 13E | ||||
| 4 | B – 15 | 25 | 29E | ||||
| 5 | C – 7 | 10 | 14E | ||||
| 6 | A – 5 | 8 | 37E | ||||
| 7 | A – 1 | 11 | 46E | ||||
| 8 | A – 1 | -17 | 66E | ||||
| 9 | F – 74 | -25 | 33E | ||||
| 10 | G – 34 | -17 | 0 | ||||
| 11 | B – 5 | -26 | 37W | ||||
| 12 | G – 8 | 20 | 54W | ||||
| 13 | C – 6 | 25 | 40W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.