Daily Sunspot Evaluation
Observation Sheet Thursday, 2 April 1953
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)
- 20
- Relative number (R)
- 60
- Observer
- MH
- Reading
- all checks consistent
- File
- 19530402.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 11 | 0.51 | 53 | |
| 2 | B – 5 | 0.22 | 79 | |
| 3 | B – 2 | 0.19 | 127 | |
| 4 | A – 2 | 0.3 | 320 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.