Daily Sunspot Evaluation
Observation Sheet Sunday, 28 February 1999
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)
- 6
- Number of spots (f)
- 46
- Relative number (R)
- 106
- Observer
- TA
- Reading
- all checks consistent
- File
- 19990228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EAI – 24 | 28 | 03W | 101 | 06W | 11 | |
| 2 | CRO – 6 | 28 | 25E | 73 | 22E | 7 | |
| 3 | AX – 6 | 18 | 29E | 69 | 26E | 3 | |
| 4 | HR – 6 | 30 | 40E | 58 | 37E | 2.5 | |
| 5 | HR – 3 | -25 | 02W | 100 | 05W | ~1 | |
| 6 | ? – 1 | -27 | 85E | 13 | 82E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.