Daily Sunspot Evaluation
Observation Sheet Friday, 17 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)
- 16
- Number of spots (f)
- 150
- Relative number (R)
- 310
- Observer
- ET
- Reading
- all checks consistent
- File
- 19581017.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 6 | 25 | 0 | ||||
| 2 | E – 17 | 20 | 15E | ||||
| 3 | A – 1 | 13 | 5E | ||||
| 4 | F – 25 | 3 | 41E | ||||
| 5 | E – 15 | -10 | 63E | ||||
| 6 | D – 6 | -4 | 12E | ||||
| 7 | B – 2 | -14 | 3E | ||||
| 8 | C – 21 | -23 | 2E | ||||
| 9 | C – 8 | -19 | 1W | ||||
| 10 | D – 12 | -15 | 12W | ||||
| 11 | B – 17 | -9 | 20W | ||||
| 12 | J – 3 | -10 | 46W | ||||
| 13 | G – 5 | -14 | 58W | ||||
| 14 | A – 1 | 14 | 38W | ||||
| 15 | A – 6 | 22 | 47W | ||||
| 16 | A – 5 | 34 | 55W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.