Daily Sunspot Evaluation
Observation Sheet Monday, 17 February 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)
- 13
- Number of spots (f)
- 35
- Relative number (R)
- 165
- Observer
- FY
- Reading
- all checks consistent
- File
- 19580217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 23 | 6E | ||||
| 2 | A – 2 | 13 | 46E | ||||
| 3 | C – 3 | 5 | 15E | ||||
| 4 | ? – 1 | -14 | 83E | ||||
| 5 | J – 2 | -15 | 45E | ||||
| 6 | J – 1 | -16 | 63E | ||||
| 7 | J – 2 | -19 | 62E | ||||
| 8 | J – 1 | -25 | 47E | ||||
| 9 | C – 5 | -14 | 12E | ||||
| 10 | A – 1 | 10 | 21W | ||||
| 11 | E – 10 | 11 | 55W | ||||
| 12 | J – 3 | 21 | 48W | ||||
| 13 | C – 3 | 12 | 20W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.