Daily Sunspot Evaluation
Observation Sheet Friday, 4 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)
- 17
- Number of spots (f)
- 153
- Relative number (R)
- 323
- Observer
- ET
- Reading
- all checks consistent
- File
- 19580404.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 21 | 33 | 4E | ||||
| 2 | B – 12 | 21 | 11E | ||||
| 3 | A – 2 | 17 | 30E | ||||
| 4 | B – 15 | 13 | 32E | ||||
| 5 | A – 3 | 16 | 50E | ||||
| 6 | ? – 14 | 12 | 66E | ||||
| 7 | A – 2 | -22 | 41E | ||||
| 8 | A – 2 | -27 | 56E | ||||
| 9 | E – 21 | -16 | 5E | ||||
| 10 | A – 2 | -15 | 6W | ||||
| 11 | C – 20 | -25 | 10W | ||||
| 12 | G – 17 | -17 | 23W | ||||
| 13 | E – 9 | -23 | 62W | ||||
| 14 | ? – 2 | -13 | 82W | ||||
| 15 | A – 2 | -8 | 76W | ||||
| 16 | C – 8 | 3 | 33W | ||||
| 17 | J – 1 | 25 | 79W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.