Daily Sunspot Evaluation
Observation Sheet Wednesday, 9 April 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)
- 13
- Number of spots (f)
- 104
- Relative number (R)
- 234
- Observer
- ET
- Reading
- all checks consistent
- File
- 19580409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 15 | 14 | 4E | ||||
| 2 | B – 13 | 13 | 59E | ||||
| 3 | B – 5 | -13 | 44E | ||||
| 4 | B – 9 | -15 | 4W | ||||
| 5 | A – 2 | -25 | 80W | ||||
| 6 | C – 5 | -17 | 65W | ||||
| 7 | B – 4 | 10 | 39W | ||||
| 8 | G – 6 | 20 | 58W | ||||
| 9 | A – 1 | 24 | 50W | ||||
| 10 | ? – 11 | 33 | 63W | ||||
| 11 | F – 29 | 17 | 12W | ||||
| 12 | A – 1 | 12 | 18W | ||||
| 13 | C – 3 | 11 | 9W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.