Daily Sunspot Evaluation
Observation Sheet Thursday, 31 May 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)
- 4
- Number of spots (f)
- 12
- Relative number (R)
- 52
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510531.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 2 | 0.75 | 32 | |
| 2 | A – 2 | 0.13 | 146 | |
| 3 | H – 4 | 0.74 | 226 | |
| 4 | H – 4 | 0.24 | 338 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.