Daily Sunspot Evaluation
Observation Sheet Thursday, 18 July 1957
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)
- 14
- Number of spots (f)
- 97
- Relative number (R)
- 237
- Observer
- KA
- Reading
- all checks consistent
- File
- 19570718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 5 | 12 | 2E | ||||
| 2 | C – 5 | 13 | 12E | ||||
| 3 | D – 9 | 26 | 25E | ||||
| 4 | E – 15 | 26 | 37E | ||||
| 5 | C – 11 | 31 | 52E | ||||
| 6 | C – 8 | 22 | 60E | ||||
| 7 | B – 14 | -9 | 20E | ||||
| 8 | B – 7 | -19 | 17E | ||||
| 9 | G – 2 | -33 | 50E | ||||
| 10 | A – 2 | -42 | 40E | ||||
| 11 | C – 7 | -35 | 11E | ||||
| 12 | H – 1 | -17 | 13W | ||||
| 13 | H – 8 | -32 | 47W | ||||
| 14 | A – 3 | 34 | 76W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.