Daily Sunspot Evaluation
Observation Sheet Thursday, 6 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)
- 19
- Relative number (R)
- 79
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720406.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 5 | 9 | 20E | 143 | |||
| 2 | ? – 2 | -7 | 81E | 82 | |||
| 3 | A – 1 | -9 | 37E | 126 | |||
| 4 | ? – 3 | -13 | 76E | 87 | |||
| 5 | D – 6 | -12 | 21W | 184 | |||
| 6 | J – 2 | -9 | 34W | 197 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.