Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 April 1967
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)
- 7
- Number of spots (f)
- 24
- Relative number (R)
- 94
- Observer
- SK
- Reading
- counts consistent, some coordinates doubtful
- File
- 19670418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 32 | 07E | 352 | |||
| 2 | H – 3 | 27 | 16E | 343 | |||
| 3 | H – 2 | 25 | 66E | 293 | |||
| 4 | ? – 1 | -13 | 98E | 269 ⚠ | |||
| 5 | H – 3 | -22 | 69E | 294 ⚠ | |||
| 6 | B – 10 | -20 | 03W | 2 | |||
| 7 | B – 4 | 18 | 60W | 59 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.