Daily Sunspot Evaluation
Observation Sheet Sunday, 17 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)
- 6
- Number of spots (f)
- 52
- Relative number (R)
- 112
- Observer
- AK
- Reading
- all checks consistent
- File
- 19610917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 19 | 60E | ||||
| 2 | E – 21 | -9 | 36W | ||||
| 3 | B – 3 | 11 | 68W | ||||
| 4 | A – 2 | 20 | 58W | ||||
| 5 | A – 2 | 21 | 45W | ||||
| 6 | F – 23 | 14 | 18W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.