Daily Sunspot Evaluation
Observation Sheet Friday, 18 July 1952
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)
- 3
- Number of spots (f)
- 16
- Relative number (R)
- 46
- Observer
- MH
- Reading
- all checks consistent
- File
- 19520718.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | ? – 2 | 0.94 | 260 | |
| 2 | E – 11 | 0.69 | 268 | |
| 3 | J – 3 | 0.71 | 287 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.