Daily Sunspot Evaluation
Observation Sheet Friday, 6 April 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)
- 6
- Number of spots (f)
- 25
- Relative number (R)
- 85
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510406.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 1 | 0.54 | 28 | |
| 2 | A – 1 | 0.7 | 34 | |
| 3 | C – 5 | 0.8 | 71 | |
| 4 | A – 1 | 0.89 | 71 | |
| 5 | C – 2 | 0.38 | 207 | |
| 6 | D – 15 | 0.35 | 325 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.