Daily Sunspot Evaluation
Observation Sheet Friday, 2 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)
- 22
- Relative number (R)
- 62
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710402.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 12 | 14 | 01E | 6 | |||
| 2 | J – 4 | -18 | 26E | 341 | |||
| 3 | H – 5 | -19 | 27W | 34 | |||
| 4 | J – 1 | -14 | 63W | 70 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.