Daily Sunspot Evaluation
Observation Sheet Sunday, 22 April 1973
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)
- 3
- Number of spots (f)
- 42
- Relative number (R)
- 72
- Observer
- ED
- Reading
- counts consistent, some coordinates doubtful
- File
- 19730422.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 27 | 11 | 25E | 143 ⚠ | 69 | ||
| 2 | ? – 2 | -6 | 87E | 87 | 70 | ||
| 3 | C – 13 | -16 | 10W | 184 | 69 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.