Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 September 1958
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)
- 16
- Number of spots (f)
- 149
- Relative number (R)
- 309
- Observer
- SG
- Reading
- all checks consistent
- File
- 19580917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 28 | 1 | 1E | ||||
| 2 | B – 5 | 19 | 15E | ||||
| 3 | B – 11 | 23 | 39E | ||||
| 4 | ? – 1 | 43 | 76E | ||||
| 5 | A – 3 | 6 | 53E | ||||
| 6 | F – 54 | -18 | 24E | ||||
| 7 | H – 2 | -14 | 8E | ||||
| 8 | G – 9 | -33 | 7W | ||||
| 9 | B – 3 | -10 | 4W | ||||
| 10 | J – 2 | -30 | 17W | ||||
| 11 | B – 7 | -22 | 52W | ||||
| 12 | C – 19 | -10 | 37W | ||||
| 13 | A – 1 | -9 | 69W | ||||
| 14 | A – 1 | 35 | 66W | ||||
| 15 | H – 1 | 14 | 9W | ||||
| 16 | A – 2 | 28 | 11W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.