Daily Sunspot Evaluation
Observation Sheet Monday, 31 July 1961
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)
- 3
- Number of spots (f)
- 13
- Relative number (R)
- 43
- Observer
- PO
- Reading
- all checks consistent
- File
- 19610731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 14 | 33E | ||||
| 2 | B – 10 | 23 | 24W | ||||
| 3 | ? – 1 | 8 | 84W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.