Daily Sunspot Evaluation
Observation Sheet Sunday, 28 February 1988
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)
- 17
- Relative number (R)
- 57
- Observer
- FL
- Reading
- all checks consistent
- File
- 19880228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARX – 1 | 19 | 57E | 152 | 56E | 0.5 | 39 |
| 2 | DAI – 8 | 17 | 64E | 145 | 63E | 7 | 40 |
| 3 | ARX – 3 | -23 | 70W | 279 | 71W | 3 | 41 |
| 4 | CAE – 5 | -21 | 45E | 164 | 44E | 2.5 | 42 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.