Daily Sunspot Evaluation
Observation Sheet Monday, 30 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)
- 5
- Number of spots (f)
- 23
- Relative number (R)
- 73
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510430.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.34 | 89 | |
| 2 | G – 3 | 0.95 | 230 | |
| 3 | J – 2 | 0.28 | 235 | |
| 4 | D – 10 | 0.5 | 243 | |
| 5 | D – 7 | 0.82 | 270 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.