Daily Sunspot Evaluation
Observation Sheet Sunday, 17 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)
- 57
- Relative number (R)
- 127
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19891217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRI – 7 | 33 | 31W | 195 | 34W | 5 | |
| 2 | AR – 1 | 27 | 18E | 146 | 15E | - | |
| 3 | CHI – 19 | 12 | 24E | 140 | 21E | 13 | |
| 4 | CAI – 6 | 19 | 42E | 122 | 39E | 4 | |
| 5 | CSI – 9 | 19 | 63E | 101 | 60E | 5 | |
| 6 | BRI – 13 | -10 | 27W | 191 | 30W | 7.5 | |
| 7 | HK – 2 | -6 | 63E | 101 | 60E | 5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.