Daily Sunspot Evaluation
Observation Sheet Saturday, 18 April 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)
- 5
- Number of spots (f)
- 51
- Relative number (R)
- 101
- Observer
- EH
- Reading
- all checks consistent
- File
- 19700418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 18 | 19E | 275 | |||
| 2 | J – 1 | 21 | 69E | 225 | |||
| 3 | E – 30 | -7 | 18E | 276 | |||
| 4 | ? – 10 | 16 | 71W | 5 | |||
| 5 | D – 9 | 12 | 33W | 327 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.