Daily Sunspot Evaluation
Observation Sheet Friday, 9 September 1955
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)
- 14
- Relative number (R)
- 74
- Observer
- FY
- Reading
- all checks consistent
- File
- 19550909.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 2 | 0.36 | 36 | |
| 2 | C – 4 | 0.63 | 182 | |
| 3 | B – 4 | 0.46 | 191 | |
| 4 | A – 1 | 0.64 | 250 | |
| 5 | A – 1 | 0.55 | 316 | |
| 6 | H – 2 | 0.48 | 339 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.