Daily Sunspot Evaluation
Observation Sheet Thursday, 18 February 1988
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)
- 5
- Number of spots (f)
- 15
- Relative number (R)
- 65
- Observer
- HG
- Reading
- all checks consistent
- File
- 19880218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HHX – 1 | 22 | 12E | 329 | 11E | 9 | 31 |
| 2 | CAO – 3 | 19 | 24E | 317 | 23E | 3.5 | 32 |
| 3 | ARX – 9 | -9 | 50W | 31 | 51W | 2.0 | 35 |
| 4 | AXX – 1 | -14 | 18E | 323 | 17E | 33 | |
| 5 | AXX – 1 | -15 | 26E | 313 | 27E | 34 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.