Daily Sunspot Evaluation
Observation Sheet Friday, 13 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)
- 96
- Relative number (R)
- 226
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 9 | 25 | 14EE | ||||
| 2 | J – 3 | 17 | 51E | ||||
| 3 | D – 3 | 14 | 60E | ||||
| 4 | A – 2 | -21 | 62E | ||||
| 5 | A – 1 | -15 | 33E | ||||
| 6 | B – 5 | -23 | 48E | ||||
| 7 | C – 5 | -44 | 27EE | ||||
| 8 | J – 4 | -21 | 12E | ||||
| 9 | J – 2 | -41 | 10E | ||||
| 10 | E – 21 | -16 | 23WEE | ||||
| 11 | C – 13 | -14 | 36W | ||||
| 12 | C – 7 | -8 | 57WE | ||||
| 13 | E – 21 | 11 | 33WE |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.