Daily Sunspot Evaluation
Observation Sheet Friday, 18 September 1959
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)
- 7
- Number of spots (f)
- 46
- Relative number (R)
- 116
- Observer
- FY
- Reading
- all checks consistent
- File
- 19590918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 20 | 14 | 18E | ||||
| 2 | J – 1 | 25 | 75E | ||||
| 3 | ? – 2 | -8 | 82E | ||||
| 4 | A – 3 | -20 | 43E | ||||
| 5 | A – 1 | -11 | 26E | ||||
| 6 | D – 14 | -16 | 5E | ||||
| 7 | C – 5 | 5 | 22W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.