Daily Sunspot Evaluation
Observation Sheet Wednesday, 28 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)
- 4
- Number of spots (f)
- 41
- Relative number (R)
- 81
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710428.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 8 | -4 | 40E | 344 | |||
| 2 | A – 6 | -11 | 09W | 33 | |||
| 3 | D – 8 | -10 | 20W | 44 | |||
| 4 | E – 19 | 8 | 06W | 30 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.