Daily Sunspot Evaluation
Observation Sheet Saturday, 17 August 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)
- 61
- Relative number (R)
- 201
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570817.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 22 | 4E | ||||
| 2 | J – 1 | 33 | 50E | ||||
| 3 | E – 14 | 18 | 64E | ||||
| 4 | J – 2 | 10 | 58E | ||||
| 5 | A – 1 | -26 | 34E | ||||
| 6 | A – 2 | -30 | 38E | ||||
| 7 | D – 8 | -21 | 22E | ||||
| 8 | C – 4 | -32 | 20E | ||||
| 9 | C – 12 | -21 | 10E | ||||
| 10 | A – 1 | -30 | 51W | ||||
| 11 | A – 1 | -9 | 33W | ||||
| 12 | ? – 5 | -15 | 72W | ||||
| 13 | J – 3 | 12 | 48W | ||||
| 14 | B – 6 | 15 | 56W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.