Daily Sunspot Evaluation
Observation Sheet Friday, 28 February 1958
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)
- 37
- Relative number (R)
- 127
- Observer
- ET
- Reading
- all checks consistent
- File
- 19580228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 8 | 35 | 5E | ||||
| 2 | A – 1 | -4 | 22E | ||||
| 3 | A – 1 | -23 | 10E | ||||
| 4 | A – 1 | -34 | 29W | ||||
| 5 | A – 3 | -27 | 65W | ||||
| 6 | E – 19 | -14 | 38W | ||||
| 7 | ? – 2 | -16 | 79W | ||||
| 8 | J – 1 | -10 | 63W | ||||
| 9 | A – 1 | 15 | 8W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.