Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 September 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)
- 5
- Number of spots (f)
- 12
- Relative number (R)
- 62
- Observer
- AK
- Reading
- all checks consistent
- File
- 19610920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 18 | 21E | ||||
| 2 | B – 3 | 3 | 19W | ||||
| 3 | ? – 1 | -10 | 79W | ||||
| 4 | G – 6 | 15 | 58W | ||||
| 5 | A – 1 | 15 | 45W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.