Daily Sunspot Evaluation
Observation Sheet Saturday, 10 April 1971
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)
- 6
- Number of spots (f)
- 13
- Relative number (R)
- 73
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710410.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | -2 | 15E | 244 | |||
| 2 | ? – 1 | 4 | 78E | 181 | |||
| 3 | ? – 1 | -5 | 87E | 172 | |||
| 4 | J – 3 | -15 | 02W | 261 | |||
| 5 | G – 3 | 11 | 74W | 333 | |||
| 6 | C – 4 | 15 | 10W | 269 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.