Daily Sunspot Evaluation
Observation Sheet Thursday, 10 February 1972
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)
- 15
- Relative number (R)
- 55
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720210.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 19 | 57E | 123 | |||
| 2 | A – 1 | 8 | 50E | 130 | |||
| 3 | C – 11 | -8 | 38E | 142 | |||
| 4 | ? – 2 | -16 | 82E | 98 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.