Daily Sunspot Evaluation
Observation Sheet Saturday, 18 October 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)
- 12
- Number of spots (f)
- 135
- Relative number (R)
- 255
- Observer
- FY
- Reading
- all checks consistent
- File
- 19581018.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 28 | 21 | 1E | ||||
| 2 | F – 25 | -4 | 28E | ||||
| 3 | ? – 1 | -7 | 80E | ||||
| 4 | D – 23 | -10 | 55E | ||||
| 5 | H – 12 | -27 | 15W | ||||
| 6 | C – 2 | -19 | 13W | ||||
| 7 | B – 4 | -3 | 8W | ||||
| 8 | C – 11 | -15 | 25W | ||||
| 9 | C – 12 | -8 | 43W | ||||
| 10 | D – 8 | -14 | 74W | ||||
| 11 | A – 1 | 14 | 8W | ||||
| 12 | D – 8 | 26 | 13W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.