Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 5
- Number of spots (f)
- 14
- Relative number (R)
- 64
- Observer
- MH
- Reading
- all checks consistent
- File
- 19510213.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 1 | 0.19 | 50 | |
| 2 | G – 3 | 0.86 | 56 | |
| 3 | A – 2 | 0.88 | 73 | |
| 4 | J – 2 | 0.56 | 88 | |
| 5 | B – 6 | 0.28 | 358 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.