Daily Sunspot Evaluation
Observation Sheet Friday, 21 February 1992
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)
- 8
- Number of spots (f)
- 28
- Relative number (R)
- 108
- Observer
- YK
- Reading
- all checks consistent
- File
- 19920221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKI – 13 | 2 | 51E | 48 | 49E | 10.5 | 81E |
| 2 | BXO – 3 | 13 | 51E | 48 | 49E | 5 | 82 |
| 3 | HK – 2 | 5 | 79E | 20 | 77E | 3 | 86 |
| 4 | AX – 1 | -15 | 47W | 146 | 49W | - | 87 |
| 5 | BXO – 6 | -7 | 09W | 108 | 11W | 4.5 | 83 |
| 6 | HS – 1 | -11 | 14E | 85 | 12E | 1 | 78 |
| 7 | HA – 1 | -6 | 64E | 35 | 62E | 3.5 | 80 |
| 8 | ? – 1 | -13 | 82E | 17 | 80E | - | 85 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.