Daily Sunspot Evaluation
Observation Sheet Saturday, 12 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)
- 14
- Number of spots (f)
- 63
- Relative number (R)
- 203
- Observer
- SG
- Reading
- all checks consistent
- File
- 19580412.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 20 | 25E | ||||
| 2 | B – 3 | 14 | 24E | ||||
| 3 | J – 1 | -5 | 47E | ||||
| 4 | B – 12 | -14 | 9E | ||||
| 5 | A – 1 | -23 | 10E | ||||
| 6 | A – 2 | -22 | 4E | ||||
| 7 | A – 1 | -16 | 31W | ||||
| 8 | B – 4 | -13 | 43W | ||||
| 9 | ? – 1 | 9 | 80W | ||||
| 10 | F – 22 | 15 | 55W | ||||
| 11 | H – 2 | 12 | 36W | ||||
| 12 | ? – 1 | 31 | 68W | ||||
| 13 | E – 9 | 15 | 28W | ||||
| 14 | B – 3 | 12 | 2W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.