Daily Sunspot Evaluation
Observation Sheet Saturday, 18 February 1978
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)
- 5
- Number of spots (f)
- 37
- Relative number (R)
- 87
- Observer
- FA
- Reading
- all checks consistent
- File
- 19780218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 11 | 31 | 19E | 284 | 18E | ||
| 2 | ? – 7 | 20 | 43E | 260 | 42E | ||
| 3 | ? – 2 | 22 | 78E | 225 | 77E | ||
| 4 | ? – 2 | 17 | 82W | 25 | 83W | ||
| 5 | D – 15 | 25 | 52W | 355 | 53W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.