Daily Sunspot Evaluation
Observation Sheet Sunday, 17 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)
- 9
- Number of spots (f)
- 36
- Relative number (R)
- 126
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 9 | 10E | ||||
| 2 | J – 1 | 15 | 12E | ||||
| 3 | A – 1 | 13 | 22E | ||||
| 4 | D – 24 | -22 | 27E | ||||
| 5 | J – 2 | -27 | 46E | ||||
| 6 | A – 1 | -26 | 32W | ||||
| 7 | B – 3 | -22 | 59W | ||||
| 8 | A – 2 | -9 | 54W | ||||
| 9 | A – 1 | 14 | 44W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.