Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 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)
- 13
- Number of spots (f)
- 100
- Relative number (R)
- 230
- Observer
- KA
- Reading
- all checks consistent
- File
- 19560918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 7 | 26 | 9E | ||||
| 2 | J – 3 | 31 | 34E | ||||
| 3 | D – 15 | 22 | 43E | ||||
| 4 | D – 12 | 28 | 59E | ||||
| 5 | H – 3 | -22 | 35E | ||||
| 6 | C – 15 | -14 | 16E | ||||
| 7 | J – 3 | -30 | 4E | ||||
| 8 | E – 26 | -17 | 20W | ||||
| 9 | C – 4 | -23 | 33W | ||||
| 10 | A – 2 | -14 | 34W | ||||
| 11 | B – 8 | 12 | 22W | ||||
| 12 | A – 1 | 45 | 79W | ||||
| 13 | A – 1 | 24 | 17W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.