Daily Sunspot Evaluation
Observation Sheet Friday, 29 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)
- 7
- Number of spots (f)
- 83
- Relative number (R)
- 153
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710129.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 14 | 9 | 25E | 91 | |||
| 2 | A – 1 | 22 | 75E | 41 | |||
| 3 | F – 31 | 7 | 50E | 66 | |||
| 4 | E – 30 | -12 | 16E | 100 | |||
| 5 | ? – 2 | -12 | 79W | 195 | |||
| 6 | J – 2 | 19 | 18W | 134 | |||
| 7 | J – 3 | 4 | 05W | 121 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.