Daily Sunspot Evaluation
Observation Sheet Sunday, 18 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)
- 3
- Number of spots (f)
- 13
- Relative number (R)
- 43
- Observer
- ED
- Reading
- counts consistent, some coordinates doubtful
- File
- 19730218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 18 | 63W | 220 ⚠ | 21 | ||
| 2 | A – 2 | -10 | 03W | 286 | 27 | ||
| 3 | D – 10 | -16 | 16W | 307 ⚠ | 25 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.