Daily Sunspot Evaluation
Observation Sheet Sunday, 17 August 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)
- 11
- Number of spots (f)
- 90
- Relative number (R)
- 200
- Observer
- ET
- Reading
- all checks consistent
- File
- 19580817.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 10 | 24 | 18E | ||||
| 2 | E – 22 | 18 | 60E | ||||
| 3 | B – 5 | 10 | 33E | ||||
| 4 | C – 11 | -14 | 61E | ||||
| 5 | A – 5 | -16 | 22E | ||||
| 6 | J – 1 | -12 | 16E | ||||
| 7 | A – 1 | -11 | 22W | ||||
| 8 | E – 15 | -25 | 67W | ||||
| 9 | F – 13 | -11 | 57W | ||||
| 10 | A – 3 | 16 | 26W | ||||
| 11 | B – 4 | 46 | 34W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.