Daily Sunspot Evaluation
Observation Sheet Monday, 19 February 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)
- 3
- Number of spots (f)
- 12
- Relative number (R)
- 42
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510219.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | ? – 10 | 0.96 | 58 | |
| 2 | A – 1 | 0.73 | 240 | |
| 3 | J – 1 | 0.52 | 288 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.