Daily Sunspot Evaluation
Observation Sheet Sunday, 15 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)
- 118
- Relative number (R)
- 248
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 6 | 41 | 13E | ||||
| 2 | A – 1 | 21 | 39E | ||||
| 3 | E – 26 | 23 | 54E | ||||
| 4 | E – 27 | 14 | 31E | ||||
| 5 | E – 16 | 9 | 67E | ||||
| 6 | J – 1 | -21 | 34E | ||||
| 7 | J – 2 | -44 | 3E | ||||
| 8 | J – 1 | -42 | 17W | ||||
| 9 | J – 3 | -21 | 15W | ||||
| 10 | G – 6 | -16 | 50W | ||||
| 11 | J – 3 | -13 | 67W | ||||
| 12 | E – 18 | 11 | 61W | ||||
| 13 | D – 8 | 25 | 13W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.