Daily Sunspot Evaluation
Observation Sheet Sunday, 9 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)
- 9
- Number of spots (f)
- 40
- Relative number (R)
- 130
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 9 | 30E | 93 | |||
| 2 | E – 12 | -9 | 40E | 83 | |||
| 3 | C – 5 | -12 | 72E | 51 | |||
| 4 | D – 8 | -14 | 35E | 88 | |||
| 5 | J – 2 | -16 | 42E | 81 | |||
| 6 | B – 5 | -10 | 04W | 127 | |||
| 7 | A – 1 | -12 | 65W | 188 | |||
| 8 | B – 4 | 8 | 21W | 144 | |||
| 9 | A – 1 | 6 | 19W | 142 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.