Daily Sunspot Evaluation
Observation Sheet Sunday, 18 September 1960
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)
- 11
- Number of spots (f)
- 74
- Relative number (R)
- 184
- Observer
- AB
- Reading
- all checks consistent
- File
- 19600918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | O – 15 | 24 | 4E | ||||
| 2 | J – 2 | 19 | 66E | ||||
| 3 | ? – 2 | 18 | 80E | ||||
| 4 | ? – 1 | -18 | 77E | ||||
| 5 | H – 21 | -19 | 42E | ||||
| 6 | C – 10 | -7 | 10E | ||||
| 7 | C – 7 | -5 | 44W | ||||
| 8 | C – 10 | 14 | 36W | ||||
| 9 | B – 3 | 23 | 43W | ||||
| 10 | A – 2 | 22 | 25W | ||||
| 11 | A – 1 | 26 | 7W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.