Daily Sunspot Evaluation
Observation Sheet Thursday, 18 February 1993
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)
- 39
- Relative number (R)
- 79
- Observer
- TA
- Reading
- all checks consistent
- File
- 19930218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 4 | 10 | 40W | 28 | 43W | 3 | 42 |
| 2 | DSC – 22 | 15 | 05W | 353 | 08W | 5 | 41 |
| 3 | DAI – 7 | -19 | 27E | 321 | 24E | 4 | 40 |
| 4 | CAO – 6 | -13 | 60E | 288 | 51E | 15 | 43 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.