Daily Sunspot Evaluation
Observation Sheet Friday, 15 December 1989
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)
- 7
- Number of spots (f)
- 31
- Relative number (R)
- 101
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19891215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 3 | 16 | 02W | 191 | 04W | 6 | |
| 2 | AR – 1 | 27 | 43E | 146 | 41E | 1 | |
| 3 | EKC – 16 | 12 | 50E | 139 | 48E | 13.5 | |
| 4 | HA – 3 | 19 | 69E | 120 | 67E | 3 | |
| 5 | HS – 1 | -9 | 28W | 217 | 30W | 1 | |
| 6 | CAO – 5 | -21 | 26E | 163 | 24E | 4 | |
| 7 | ? – 2 | -6 | 85E | 104 | 83E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.