Daily Sunspot Evaluation
Observation Sheet Thursday, 20 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)
- 27
- Relative number (R)
- 107
- Observer
- MB
- Reading
- all checks consistent
- File
- 19920220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 19 | 70W | 182 | 72W | 2 | 76 |
| 2 | AX – 2 | 14 | 63E | 49 | 61E | 1 | 82 |
| 3 | EKC – 8 | 4 | 65E | 47 | 63E | 12 | 81 |
| 4 | HA – 8 | -12 | 72W | 184 | 74W | 8 | 64 |
| 5 | BXO – 3 | -24 | 71W | 183 | 73W | 4 | 84 |
| 6 | AX – 2 | -7 | 07E | 105 | 05E | 2 | 83 |
| 7 | HA – 2 | -19 | 28E | 84 | 26E | 1.5 | 78 |
| 8 | HS – 1 | -4 | 77E | 35 | 75E | 2.5 | 80 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.