Daily Sunspot Evaluation
Observation Sheet Friday, 7 April 1972
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)
- 6
- Number of spots (f)
- 38
- Relative number (R)
- 98
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 13 | 8 | 05E | 143 | |||
| 2 | E – 7 | -6 | 66E | 82 | |||
| 3 | A – 3 | -9 | 22E | 126 | |||
| 4 | D – 7 | -14 | 62E | 86 | |||
| 5 | G – 6 | -12 | 36W | 184 | |||
| 6 | A – 2 | -9 | 50W | 198 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.