Daily Sunspot Evaluation
Observation Sheet Tuesday, 30 January 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)
- 73
- Relative number (R)
- 123
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510130.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 6 | 0.61 | 27 | |
| 2 | D – 6 | 0.65 | 246 | |
| 3 | H – 4 | 0.5 | 252 | |
| 4 | D – 16 | 0.56 | 288 | |
| 5 | F – 41 | 0.3 | 317 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.