Daily Sunspot Evaluation
Observation Sheet Friday, 30 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)
- 15
- Relative number (R)
- 55
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710430.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 1 | -5 | 11E | 348 | |||
| 2 | C – 4 | -14 | 63E | 294 | |||
| 3 | J – 1 | -12 | 43W | 40 | |||
| 4 | G – 9 | 7 | 34W | 31 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.