Daily Sunspot Evaluation
Observation Sheet Friday, 28 February 2003
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)
- 5
- Number of spots (f)
- 18
- Relative number (R)
- 68
- Observer
- ZFB
- Reading
- all checks consistent
- File
- 20030228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 18 | 80W | 334 | 83W | - | 42 |
| 2 | ? – 1 | 12 | 80E | 174 | 77E | - | 48 |
| 3 | AX – 1 | -8 | 48W | 302 | 51W | - | 45 |
| 4 | DRO – 11 | -7 | 39E | 215 | 36E | 4 | 46 |
| 5 | HA – 4 | -18 | 63E | 191 | 60E | 4 | 47 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.