Daily Sunspot Evaluation
Observation Sheet Sunday, 13 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)
- 15
- Number of spots (f)
- 48
- Relative number (R)
- 198
- Observer
- FY
- Reading
- all checks consistent
- File
- 19580413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 6 | 11 | 6E | ||||
| 2 | B – 3 | 14 | 14E | ||||
| 3 | ? – 1 | 40 | 60E | ||||
| 4 | ? – 1 | 22 | 73E | ||||
| 5 | J – 1 | -5 | 32E | ||||
| 6 | B – 2 | -16 | 35E | ||||
| 7 | A – 1 | -7 | 2E | ||||
| 8 | B – 7 | -22 | 6W | ||||
| 9 | B – 3 | -15 | 6W | ||||
| 10 | A – 1 | -13 | 57W | ||||
| 11 | E – 11 | 14 | 71W | ||||
| 12 | H – 1 | 12 | 52W | ||||
| 13 | C – 8 | 15 | 43W | ||||
| 14 | A – 1 | 25 | 40W | ||||
| 15 | A – 1 | 41 | 35W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.