Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 2
- Number of spots (f)
- 20
- Relative number (R)
- 40
- Observer
- MH
- Reading
- all checks consistent
- File
- 19550913.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 19 | 0.47 | 76 | |
| 2 | J – 1 | 0.96 | 320 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.