Daily Sunspot Evaluation
Observation Sheet Sunday, 9 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)
- 23
- Relative number (R)
- 83
- Observer
- MH
- Reading
- all checks consistent
- File
- 19510909.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 1 | 0.84 | 97 | |
| 2 | D – 6 | 0.92 | 108 | |
| 3 | A – 1 | 0.59 | 117 | |
| 4 | J – 2 | 0.18 | 190 | |
| 5 | B – 9 | 0.31 | 214 | |
| 6 | C – 4 | 0.76 | 278 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.