Daily Sunspot Evaluation
Observation Sheet Friday, 7 September 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)
- 44
- Relative number (R)
- 104
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510907.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 1 | 0.5 | 113 | |
| 2 | A – 2 | 0.7 | 125 | |
| 3 | H – 9 | 0.56 | 128 | |
| 4 | A – 2 | 0.56 | 143 | |
| 5 | J – 1 | 0.37 | 258 | |
| 6 | C – 29 | 0.33 | 303 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.