Daily Sunspot Evaluation
Observation Sheet Wednesday, 7 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)
- 24
- Relative number (R)
- 84
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 4 | 15 | 29E | 272 | |||
| 2 | J – 2 | -4 | 56E | 245 | |||
| 3 | J – 3 | -14 | 38E | 263 | |||
| 4 | A – 1 | -20 | 41E | 260 | |||
| 5 | A – 1 | 10 | 66W | 7 | |||
| 6 | C – 13 | 11 | 32W | 333 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.