Daily Sunspot Evaluation
Observation Sheet Thursday, 13 September 1956
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)
- 16
- Number of spots (f)
- 175
- Relative number (R)
- 335
- Observer
- KA
- Reading
- all checks consistent
- File
- 19560913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 7 | 44 | 12W | ||||
| 2 | B – 5 | 21 | 6E | ||||
| 3 | A – 1 | 27 | 44E | ||||
| 4 | A – 2 | 21 | 34E | ||||
| 5 | D – 9 | 22 | 46E | ||||
| 6 | J – 1 | 25 | 72E | ||||
| 7 | J – 1 | -13 | 76E | ||||
| 8 | B – 2 | -23 | 51E | ||||
| 9 | E – 45 | -19 | 40E | ||||
| 10 | J – 2 | -30 | 63E | ||||
| 11 | H – 2 | -24 | 27E | ||||
| 12 | E – 74 | -23 | 28W | ||||
| 13 | A – 1 | -17 | 35W | ||||
| 14 | C – 7 | -15 | 49W | ||||
| 15 | C – 13 | 21 | 52W | ||||
| 16 | B – 3 | 15 | 21W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.