Daily Sunspot Evaluation
Observation Sheet Tuesday, 11 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)
- 54
- Relative number (R)
- 114
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720411.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 9 | 71E | 26 | |||
| 2 | E – 17 | -7 | 14E | 83 | |||
| 3 | C – 19 | -11 | 45E | 52 | |||
| 4 | C – 11 | -16 | 09E | 88 | |||
| 5 | J – 1 | -18 | 17E | 80 | |||
| 6 | A – 4 | -9 | 32W | 129 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.