Daily Sunspot Evaluation
Observation Sheet Thursday, 18 December 1952
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)
- 56
- Relative number (R)
- 106
- Observer
- WG
- Reading
- all checks consistent
- File
- 19521218.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | H – 5 | 0.12 | 17 | |
| 2 | D – 15 | 0.4 | 116 | |
| 3 | A – 1 | 0.57 | 117 | |
| 4 | C – 27 | 0.3 | 247 | |
| 5 | Z – 8 | 0.92 | 301 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.