Daily Sunspot Evaluation
Observation Sheet Thursday, 26 September 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)
- 108
- Relative number (R)
- 238
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570926.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 28 | 25E | ||||
| 2 | A – 4 | 25 | 18E | ||||
| 3 | B – 5 | 21 | 22E | ||||
| 4 | A – 1 | 22 | 36E | ||||
| 5 | C – 3 | 21 | 14E | ||||
| 6 | E – 49 | 14 | 12E | ||||
| 7 | G – 6 | 12 | 33E | ||||
| 8 | H – 8 | 16 | 60E | ||||
| 9 | C – 11 | -26 | 32E | ||||
| 10 | B – 7 | -13 | 25W | ||||
| 11 | A – 1 | -29 | 51W | ||||
| 12 | H – 9 | 11 | 66W | ||||
| 13 | ? – 3 | 27 | 82W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.