Daily Sunspot Evaluation
Observation Sheet Saturday, 13 September 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)
- 176
- Relative number (R)
- 356
- Observer
- AB
- Reading
- all checks consistent
- File
- 19580913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 33 | 48E | ||||
| 2 | B – 7 | 14 | 20E | ||||
| 3 | E – 30 | 15 | 54E | ||||
| 4 | E – 9 | -15 | 74E | ||||
| 5 | A – 1 | -11 | 51E | ||||
| 6 | E – 15 | -32 | 40E | ||||
| 7 | E – 15 | -10 | 16E | ||||
| 8 | A – 2 | -9 | 8E | ||||
| 9 | A – 1 | -9 | 2E | ||||
| 10 | B – 7 | -22 | 3E | ||||
| 11 | B – 6 | -9 | 17W | ||||
| 12 | E – 30 | -10 | 66W | ||||
| 13 | A – 2 | 10 | 27W | ||||
| 14 | D – 4 | 9 | 71W | ||||
| 15 | D – 5 | 19 | 46W | ||||
| 16 | B – 3 | 18 | 35W | ||||
| 17 | B – 5 | 18 | 19W | ||||
| 18 | E – 33 | 21 | 5W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.