Daily Sunspot Evaluation
Observation Sheet Friday, 18 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)
- 82
- Relative number (R)
- 182
- Observer
- SM
- Reading
- all checks consistent
- File
- 19690418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 5 | 22 | 11E | 61 | |||
| 2 | B – 6 | 24 | 33E | 39 | |||
| 3 | J – 1 | -15 | 09E | 63 | |||
| 4 | C – 6 | -20 | 10E | 62 | |||
| 5 | C – 14 | -14 | 19W | 91 | |||
| 6 | A – 2 | -15 | 56W | 128 | |||
| 7 | D – 11 | -7 | 41W | 113 | |||
| 8 | D – 25 | 9 | 18W | 90 | |||
| 9 | A – 1 | 15 | 34W | 106 | |||
| 10 | B – 11 | 20 | 14W | 86 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.