Daily Sunspot Evaluation
Observation Sheet Thursday, 18 October 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)
- 3
- Number of spots (f)
- 17
- Relative number (R)
- 47
- Observer
- WG
- Reading
- all checks consistent
- File
- 19511018.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | ? – 1 | 0.95 | 100 | |
| 2 | G – 10 | 0.82 | 278 | |
| 3 | T – 6 | 0.38 | 311 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.