Daily Sunspot Evaluation
Observation Sheet Sunday, 18 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)
- 4
- Number of spots (f)
- 6
- Relative number (R)
- 46
- Observer
- MH
- Reading
- all checks consistent
- File
- 19550918.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 2 | 0.8 | 255 | |
| 2 | A – 1 | 0.87 | 261 | |
| 3 | J – 2 | 0.78 | 317 | |
| 4 | A – 1 | 0.75 | 332 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.