Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 March 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)
- 4
- Number of spots (f)
- 9
- Relative number (R)
- 49
- Observer
- EH
- Reading
- all checks consistent
- File
- 19700318.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 18 | 78E | 261 | |||
| 2 | J – 1 | -3 | 76E | 263 | |||
| 3 | H – 4 | -14 | 34E | 305 | |||
| 4 | H – 3 | 1 | 44W | 23 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.