Daily Sunspot Evaluation
Observation Sheet Thursday, 13 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)
- 11
- Number of spots (f)
- 81
- Relative number (R)
- 191
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570613.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 45 | 33 | 18E | ||||
| 2 | A – 5 | 11 | 64E | ||||
| 3 | A – 2 | -13 | 64E | ||||
| 4 | ? – 1 | -17 | 85E | ||||
| 5 | J – 1 | -18 | 61E | ||||
| 6 | ? – 2 | -21 | 77E | ||||
| 7 | J – 1 | -20 | 39E | ||||
| 8 | ? – 6 | -29 | 76W | ||||
| 9 | H – 4 | -18 | 67W | ||||
| 10 | ? – 1 | 11 | 80W | ||||
| 11 | D – 13 | 14 | 4W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.