Daily Sunspot Evaluation
Observation Sheet Saturday, 18 August 1951
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)
- 2
- Number of spots (f)
- 33
- Relative number (R)
- 53
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510818.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 15 | 0.7 | 141 | |
| 2 | C – 18 | 0.43 | 180 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.