Daily Sunspot Evaluation
Observation Sheet Monday, 19 March 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)
- 17
- Relative number (R)
- 67
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510319.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | H – 11 | 0.18 | 42 | |
| 2 | J – 1 | 0.3 | 57 | |
| 3 | A – 2 | 0.27 | 83 | |
| 4 | A – 1 | 0.34 | 240 | |
| 5 | A – 2 | 0.55 | 276 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.