Daily Sunspot Evaluation
Observation Sheet Friday, 15 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)
- 4
- Number of spots (f)
- 56
- Relative number (R)
- 96
- Observer
- MH
- Reading
- all checks consistent
- File
- 19610915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 7 | 14 | 9E | ||||
| 2 | F – 29 | -12 | 10W | ||||
| 3 | C – 6 | 10 | 40W | ||||
| 4 | B – 14 | 20 | 23W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.