Daily Sunspot Evaluation
Observation Sheet Thursday, 2 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)
- 9
- Number of spots (f)
- 54
- Relative number (R)
- 144
- Observer
- SM
- Reading
- all checks consistent
- File
- 19700402.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 23 | 73E | 72 | |||
| 2 | A – 1 | -7 | 21E | 124 | |||
| 3 | E – 13 | -13 | 58E | 87 | |||
| 4 | ? – 2 | -14 | 83E | 62 | |||
| 5 | J – 1 | -21 | 21W | 166 | |||
| 6 | A – 1 | -14 | 51W | 196 | |||
| 7 | D – 10 | 5 | 29W | 174 | |||
| 8 | H – 23 | 4 | 17W | 162 | |||
| 9 | ? – 2 | 22 | 74W | 219 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.