Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 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)
- 44
- Relative number (R)
- 174
- Observer
- AK
- Reading
- all checks consistent
- File
- 19580415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 40 | 34E | ||||
| 2 | ? – 2 | 40 | 69E | ||||
| 3 | A – 2 | -5 | 3E | ||||
| 4 | J – 2 | 20 | 50E | ||||
| 5 | A – 2 | 16 | 46E | ||||
| 6 | C – 17 | -21 | 75E | ||||
| 7 | A – 2 | -16 | 9E | ||||
| 8 | A – 2 | -15 | 3E | ||||
| 9 | C – 5 | -11 | 34W | ||||
| 10 | ? – 1 | 12 | 81W | ||||
| 11 | J – 2 | 15 | 74W | ||||
| 12 | A – 4 | 27 | 71W | ||||
| 13 | B – 2 | 15 | 18W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.