Daily Sunspot Evaluation
Observation Sheet Saturday, 28 December 1991
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)
- 83
- Relative number (R)
- 123
- Observer
- MB
- Reading
- all checks consistent
- File
- 19911228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 20 | -14 | 41W | 143 | 42W | 9.5 | 689 |
| 2 | FKC – 39 | -17 | 05E | 97 | 04E | 22 | 690 |
| 3 | FKC – 21 | -14 | 26E | 76 | 25E | 17 | 691 |
| 4 | HA – 3 | -4 | 45E | 57 | 44E | 2.5 | 692 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.