Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 June 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)
- 17
- Number of spots (f)
- 147
- Relative number (R)
- 317
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570618.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 6 | 25 | 46E | ||||
| 2 | ? – 1 | 28 | 69E | ||||
| 3 | ? – 1 | 20 | 77E | ||||
| 4 | F – 29 | 18 | 54E | ||||
| 5 | J – 1 | -14 | 34E | ||||
| 6 | A – 1 | -16 | 27E | ||||
| 7 | A – 2 | -21 | 22E | ||||
| 8 | E – 19 | -15 | 15E | ||||
| 9 | F – 35 | -38 | 36E | ||||
| 10 | B – 4 | -22 | 12E | ||||
| 11 | D – 18 | -17 | 4E | ||||
| 12 | B – 5 | -17 | 6W | ||||
| 13 | A – 1 | -10 | 58W | ||||
| 14 | A – 1 | 11 | 75W | ||||
| 15 | D – 20 | 32 | 48W | ||||
| 16 | A – 1 | 30 | 38W | ||||
| 17 | A – 2 | 34 | 36W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.