Daily Sunspot Evaluation
Observation Sheet Thursday, 17 August 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)
- 7
- Number of spots (f)
- 43
- Relative number (R)
- 113
- Observer
- KA
- Reading
- all checks consistent
- File
- 19610817.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 4 | 8 | 52E | ||||
| 2 | J – 2 | -15 | 39E | ||||
| 3 | B – 4 | -3 | 27E | ||||
| 4 | ? – 8 | 1 | 13E | ||||
| 5 | E – 15 | 8 | 16W | ||||
| 6 | A – 2 | 10 | 44W | ||||
| 7 | B – 8 | 13 | 43W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.