Daily Sunspot Evaluation
Observation Sheet Sunday, 13 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)
- 10
- Number of spots (f)
- 45
- Relative number (R)
- 145
- Observer
- MÖ
- Reading
- all checks consistent
- File
- 19690413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 15 | 33E | 105 | |||
| 2 | A – 6 | 19 | 52E | 86 | |||
| 3 | ? – 4 | 22 | 80E | 58 | |||
| 4 | H – 2 | 11 | 51E | 87 | |||
| 5 | H – 13 | -7 | 26E | 112 | |||
| 6 | J – 1 | -15 | 74E | 61 | |||
| 7 | C – 12 | -14 | 15E | 123 | |||
| 8 | J – 1 | -19 | 49W | 187 | |||
| 9 | H – 2 | 10 | 58W | 196 | |||
| 10 | A – 3 | 15 | 40W | 178 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.