Daily Sunspot Evaluation
Observation Sheet Friday, 9 February 1973
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)
- 12
- Relative number (R)
- 52
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730209.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 4 | 13 | 14E | 29 | 23 | ||
| 2 | J – 2 | 10 | 27E | 16 | 20 | ||
| 3 | J – 4 | 6 | 30E | 13 | 22 | ||
| 4 | A – 2 | -5 | 70E | 333 | 24 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.