Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 April 1974
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)
- 5
- Number of spots (f)
- 46
- Relative number (R)
- 96
- Observer
- ED
- Reading
- all checks consistent
- File
- 19740417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | -9 | 47E | 56 | |||
| 2 | B – 4 | -12 | 21W | 124 | |||
| 3 | A – 1 | -9 | 15W | 118 | |||
| 4 | ? – 18 | -11 | 82W | 185 | |||
| 5 | D – 22 | -13 | 62W | 165 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.