Daily Sunspot Evaluation
Observation Sheet Monday, 18 February 1957
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)
- 8
- Number of spots (f)
- 103
- Relative number (R)
- 183
- Observer
- KA
- Reading
- all checks consistent
- File
- 19570218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 6 | -14 | 76E | ||||
| 2 | J – 3 | -27 | 33E | ||||
| 3 | E – 75 | -23 | 14E | ||||
| 4 | A – 2 | -26 | 46W | ||||
| 5 | A – 1 | -22 | 72W | ||||
| 6 | H – 13 | -10 | 73W | ||||
| 7 | J – 2 | 8 | 5W | ||||
| 8 | J – 1 | 16 | 2W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.