Daily Sunspot Evaluation
Observation Sheet Friday, 15 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)
- 10
- Number of spots (f)
- 51
- Relative number (R)
- 151
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570315.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 7 | 15 | 11E | ||||
| 2 | J – 2 | 10 | 28E | ||||
| 3 | A – 1 | -22 | 38E | ||||
| 4 | C – 9 | -24 | 49E | ||||
| 5 | A – 1 | -31 | 71E | ||||
| 6 | E – 18 | -21 | 9E | ||||
| 7 | B – 3 | -37 | 13E | ||||
| 8 | C – 4 | -38 | 3E | ||||
| 9 | A – 2 | -18 | 31W | ||||
| 10 | A – 4 | 13 | 40W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.