Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 February 1970
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)
- 48
- Relative number (R)
- 128
- Observer
- EH
- Reading
- all checks consistent
- File
- 19700218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | -8 | 83E | 268 | |||
| 2 | G – 11 | -15 | 52E | 299 | |||
| 3 | H – 3 | -20 | 60E | 291 | |||
| 4 | E – 12 | -23 | 14E | 337 | |||
| 5 | D – 13 | -14 | 12W | 3 | |||
| 6 | J – 1 | -22 | 73W | 64 | |||
| 7 | J – 1 | -15 | 74W | 65 | |||
| 8 | D – 6 | 21 | 39W | 30 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.