Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 January 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)
- 78
- Relative number (R)
- 138
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710120.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 32 | 19 | 13E | 222 | |||
| 2 | B – 4 | 19 | 22E | 212 | |||
| 3 | C – 16 | 11 | 44E | 191 | |||
| 4 | J – 1 | 15 | 67E | 168 | |||
| 5 | E – 24 | -12 | 45E | 190 | |||
| 6 | J – 1 | 21 | 65W | 300 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.