Daily Sunspot Evaluation
Observation Sheet Saturday, 28 September 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)
- 12
- Number of spots (f)
- 124
- Relative number (R)
- 244
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570928.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 10 | 11 | 2 | |
| 2 | F – 22 | 16 | 31 | |
| 3 | C – 9 | 28 | 56 | |
| 4 | A – 1 | -14 | 57 | |
| 5 | ? – 1 | -24 | 74 | |
| 6 | B – 2 | -28 | 38 | |
| 7 | B – 2 | -16 | 5 | |
| 8 | D – 21 | -27 | 3 | |
| 9 | B – 3 | -14 | 55 | |
| 10 | E – 39 | 14 | 18 | |
| 11 | H – 2 | 19 | 15 | |
| 12 | C – 12 | 22 | 10 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.