Daily Sunspot Evaluation
Observation Sheet Thursday, 15 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)
- 10
- Number of spots (f)
- 42
- Relative number (R)
- 142
- Observer
- BG
- Reading
- all checks consistent
- File
- 19600915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 11 | 5E | ||||
| 2 | C – 5 | 26 | 35E | ||||
| 3 | J – 1 | -6 | 51E | ||||
| 4 | ? – 3 | -19 | 79E | ||||
| 5 | C – 11 | -3 | 2W | ||||
| 6 | B – 7 | -18 | 33W | ||||
| 7 | H – 1 | -15 | 59W | ||||
| 8 | A – 1 | -9 | 27W | ||||
| 9 | ? – 4 | 18 | 80W | ||||
| 10 | C – 7 | 14 | 0 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.