Daily Sunspot Evaluation
Observation Sheet Tuesday, 23 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)
- 6
- Number of spots (f)
- 17
- Relative number (R)
- 77
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510123.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 1 | 0.3 | 1 | |
| 2 | ? – 2 | 0.99 | 72 | |
| 3 | A – 1 | 0.22 | 82 | |
| 4 | D – 7 | 0.94 | 90 | |
| 5 | C – 4 | 0.19 | 261 | |
| 6 | A – 2 | 0.97 | 278 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.