Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 October 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)
- 29
- Relative number (R)
- 69
- Observer
- FA
- Reading
- all checks consistent
- File
- 19711020.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 4 | 18 | 42E | 189 | |||
| 2 | F – 22 | 8 | 19E | 210 | |||
| 3 | B – 2 | -12 | 26E | 203 | |||
| 4 | A – 1 | 4 | 47W | 276 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.