Daily Sunspot Evaluation
Observation Sheet Monday, 7 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)
- 18
- Number of spots (f)
- 138
- Relative number (R)
- 318
- Observer
- FY
- Reading
- all checks consistent
- File
- 19580407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 35 | 17 | 11E | ||||
| 2 | A – 1 | 43 | 39E | ||||
| 3 | A – 1 | 45 | 52E | ||||
| 4 | J – 5 | 10 | 19E | ||||
| 5 | F – 33 | 14 | 30E | ||||
| 6 | J – 3 | 9 | 33E | ||||
| 7 | A – 1 | 6 | 42E | ||||
| 8 | A – 1 | -9 | 19E | ||||
| 9 | B – 3 | -14 | 25E | ||||
| 10 | A – 4 | -27 | 48W | ||||
| 11 | D – 5 | -17 | 37W | ||||
| 12 | H – 8 | -18 | 67W | ||||
| 13 | J – 1 | 26 | 58W | ||||
| 14 | A – 3 | 22 | 28W | ||||
| 15 | E – 27 | 33 | 36W | ||||
| 16 | J – 2 | 24 | 21W | ||||
| 17 | A – 3 | 25 | 17W | ||||
| 18 | A – 2 | 11 | 10W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.