Daily Sunspot Evaluation
Observation Sheet Sunday, 11 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)
- 6
- Number of spots (f)
- 21
- Relative number (R)
- 81
- Observer
- ED
- Reading
- all checks consistent
- File
- 19730211.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 3 | 11 | 01E | 16 | 20 | ||
| 2 | J – 5 | 7 | 04E | 13 | 22 | ||
| 3 | A – 2 | 13 | 12E | 5 | 26 | ||
| 4 | I – 1 | -4 | 43E | 334 | 24 | ||
| 5 | H – 3 | -17 | 68E | 309 | 25 | ||
| 6 | B – 7 | 13 | 13W | 30 | 23 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.