Daily Sunspot Evaluation
Observation Sheet Friday, 11 April 1969
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)
- 31
- Relative number (R)
- 91
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690411.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 16 | 58E | 105 | |||
| 2 | ? – 2 | 11 | 77E | 86 | |||
| 3 | G – 12 | -6 | 51E | 112 | |||
| 4 | C – 8 | -14 | 40E | 123 | |||
| 5 | J – 1 | -19 | 24W | 187 | |||
| 6 | H – 7 | 10 | 33W | 196 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.