Daily Sunspot Evaluation
Observation Sheet Sunday, 18 December 1983
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)
- 28
- Relative number (R)
- 68
- Observer
- HG
- Reading
- all checks consistent
- File
- 19831218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 6 | 2 | 55W | 336 | 57W | 5 | 334 |
| 2 | AXX – 2 | -13 | 07W | 288 | 09W | 337 | |
| 3 | AXX – 1 | -16 | 04W | 285 | 06W | 338 | |
| 4 | CAI – 19 | -10 | 18E | 263 | 16E | 10 | 339 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.