Daily Sunspot Evaluation
Observation Sheet Saturday, 20 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)
- 5
- Number of spots (f)
- 29
- Relative number (R)
- 79
- Observer
- WG
- Reading
- all checks consistent
- File
- 19511020.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 3 | 0.17 | 89 | |
| 2 | A – 1 | 0.74 | 99 | |
| 3 | ? – 4 | 0.99 | 284 | |
| 4 | J – 1 | 0.75 | 306 | |
| 5 | D – 20 | 0.4 | 308 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.