Daily Sunspot Evaluation
Observation Sheet Tuesday, 6 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)
- 26
- Relative number (R)
- 86
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710406.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 3 | 17 | 39E | 272 | |||
| 2 | J – 2 | -2 | 66E | 245 | |||
| 3 | J – 5 | -12 | 47E | 264 | |||
| 4 | ? – 1 | -20 | 79W | 30 | |||
| 5 | A – 1 | 11 | 57W | 8 | |||
| 6 | C – 14 | 12 | 23W | 334 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.