Daily Sunspot Evaluation
Observation Sheet Friday, 28 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)
- 15
- Number of spots (f)
- 97
- Relative number (R)
- 247
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19920228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HK – 12 | 3 | 45W | 52 | 47W | 7 | 81 |
| 2 | CAO – 26 | 7 | 18W | 25 | 20W | 13 | 86 |
| 3 | CSO – 4 | 15 | 00 | 27 | 02W | 4.5 | 88 |
| 4 | AX – 1 | 19 | 13E | 354 | 11E | - | 95 |
| 5 | CAO – 12 | 11 | 17E | 350 | 15E | 6 | 94 |
| 6 | HA – 4 | 20 | 22E | 345 | 20E | 2 | 93 |
| 7 | ? – 1 | -10 | 77W | 84 | 79W | - | 78 |
| 8 | HK – 4 | -4 | 28W | 35 | 30W | 4 | 80 |
| 9 | BXI – 10 | -10 | 27W | 34 | 29W | 6 | 86 |
| 10 | DAI – 8 | -11 | 08W | 15 | 10W | 7 | 85 |
| 11 | AX – 3 | -14 | 01W | 8 | 03W | 1 | 102 |
| 12 | AX – 4 | -16 | 24E | 343 | 22E | 2 | 92 |
| 13 | AX – 1 | -12 | 25E | 342 | 23E | - | 101 |
| 14 | BXO – 2 | -19 | 36E | 331 | 34E | 3.5 | 100 |
| 15 | AX – 5 | -12 | 55E | 312 | 53E | 3 | 98 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.