Daily Sunspot Evaluation
Observation Sheet Thursday, 9 April 1970
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)
- 11
- Number of spots (f)
- 121
- Relative number (R)
- 231
- Observer
- SM
- Reading
- all checks consistent
- File
- 19700409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 11 | 16 | 49E | 3 | |||
| 2 | J – 1 | -2 | 23E | 29 | |||
| 3 | A – 2 | -14 | 56E | 356 | |||
| 4 | E – 55 | -13 | 0 | 52 | |||
| 5 | A – 2 | -24 | 07E | 45 | |||
| 6 | G – 4 | -14 | 36W | 88 | |||
| 7 | G – 8 | 8 | 39W | 91 | |||
| 8 | H – 8 | 15 | 40W | 92 | |||
| 9 | J – 2 | 19 | 37W | 89 | |||
| 10 | B – 6 | 27 | 18W | 70 | |||
| 11 | C – 22 | 10 | 03W | 55 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.