Daily Sunspot Evaluation
Observation Sheet Monday, 18 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)
- 9
- Number of spots (f)
- 54
- Relative number (R)
- 144
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570318.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 32 | 35E | ||||
| 2 | A – 1 | 26 | 28E | ||||
| 3 | J – 1 | 33 | 53E | ||||
| 4 | ? – 5 | -16 | 70E | ||||
| 5 | D – 14 | -24 | 10E | ||||
| 6 | B – 5 | -38 | 28W | ||||
| 7 | E – 23 | -22 | 30W | ||||
| 8 | B – 2 | 11 | 50W | ||||
| 9 | J – 1 | 10 | 12W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.