Daily Sunspot Evaluation
Observation Sheet Sunday, 31 March 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)
- 66
- Relative number (R)
- 176
- Observer
- KA
- Reading
- all checks consistent
- File
- 19570331.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 4 | -23 | 64E | ||||
| 2 | D – 10 | -14 | 64W | ||||
| 3 | B – 3 | 9 | 35W | ||||
| 4 | C – 8 | 27 | 65W | ||||
| 5 | B – 2 | 14 | 32W | ||||
| 6 | A – 3 | 31 | 58W | ||||
| 7 | D – 16 | 12 | 13W | ||||
| 8 | A – 4 | 24 | 23W | ||||
| 9 | B – 6 | 28 | 19W | ||||
| 10 | A – 1 | 24 | 18W | ||||
| 11 | B – 9 | 21 | 9W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.