Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 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)
- 64
- Relative number (R)
- 174
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570313.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 3 | 17 | 3 | |
| 2 | B – 2 | 16 | 39 | |
| 3 | A – 3 | 10 | 56 | |
| 4 | A – 3 | -21 | 66 | |
| 5 | A – 1 | -23 | 79 | |
| 6 | D – 23 | -21 | 36 | |
| 7 | A – 4 | -23 | 15 | |
| 8 | C – 8 | -38 | 35 | |
| 9 | B – 8 | -18 | 5 | |
| 10 | A – 1 | -18 | 22 | |
| 11 | C – 8 | 13 | 11 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.