Daily Sunspot Evaluation
Observation Sheet Sunday, 4 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)
- 8
- Number of spots (f)
- 14
- Relative number (R)
- 94
- Observer
- SM
- Reading
- all checks consistent
- File
- 19710404.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 14 | 34E | 303 | |||
| 2 | H – 2 | 17 | 67E | 270 | |||
| 3 | J – 2 | -12 | 75E | 262 | |||
| 4 | A – 1 | -17 | 76E | 261 | |||
| 5 | A – 1 | -19 | 01W | 338 | |||
| 6 | G – 4 | -20 | 54W | 31 | |||
| 7 | A – 1 | -20 | 48W | 25 | |||
| 8 | J – 2 | 11 | 30W | 7 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.