Daily Sunspot Evaluation
Observation Sheet Saturday, 31 March 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)
- 4
- Number of spots (f)
- 30
- Relative number (R)
- 70
- Observer
- ED
- Reading
- all checks consistent
- File
- 19730331.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 4 | 12 | 64E | 39 | 54 | ||
| 2 | E – 20 | -6 | 25E | 78 | 52 | ||
| 3 | H – 3 | 7 | 43W | 146 | 50 | ||
| 4 | C – 3 | 9 | 34W | 137 | 55 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.