Daily Sunspot Evaluation
Observation Sheet Saturday, 24 April 1971
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)
- 7
- Number of spots (f)
- 23
- Relative number (R)
- 93
- Observer
- SM
- Reading
- all checks consistent
- File
- 19710424.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 9 | -11 | 33E | 44 | |||
| 2 | A – 5 | -12 | 44E | 33 | |||
| 3 | A – 2 | -10 | 60W | 137 | |||
| 4 | G – 3 | 4 | 79W | 156 | |||
| 5 | ? – 1 | 8 | 85W | 162 | |||
| 6 | A – 2 | 17 | 74W | 151 | |||
| 7 | A – 1 | 3 | 19W | 96 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.