Daily Sunspot Evaluation
Observation Sheet Saturday, 28 February 1998
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)
- 35
- Relative number (R)
- 75
- Observer
- MB
- Reading
- all checks consistent
- File
- 19980228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 11 | 15 | 43W | 277 | 45W | 8 | 36 26 |
| 2 | CAO – 9 | -22 | 50W | 284 | 52W | 7.5 | 40 58 |
| 3 | BXO – 4 | -27 | 26W | 260 | 28W | 8 | 38 21 |
| 4 | CAO – 11 | -25 | 02W | 236 | 04W | 5 | 41 24 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.