Daily Sunspot Evaluation
Observation Sheet Tuesday, 28 February 1989
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)
- 10
- Number of spots (f)
- 67
- Relative number (R)
- 167
- Observer
- HE
- Reading
- all checks consistent
- File
- 19890228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 16 | 78W | 138 | 81W | 14.0 | 50 |
| 2 | BRO – 15 | 14 | 56W | 116 | 69W | 10.0 | 65 |
| 3 | HA – 4 | 11 | 05E | 56 | 02E | 2.5 | 101 |
| 4 | AX – 1 | 38 | 16E | 44 | 13E | - | 160 |
| 5 | AX – 4 | 16 | 17E | 43 | 14E | 3.5 | 170 |
| 6 | AX – 1 | -10 | 48W | 108 | 51W | 0.5 | 192 |
| 7 | BXO – 4 | -18 | 47W | 107 | 50W | 2.5 | 41 |
| 8 | AX – 1 | -18 | 36W | 96 | 39W | - | 101 |
| 9 | BXO – 5 | -25 | 06W | 66 | 09W | 6.0 | 160 |
| 10 | BRI – 30 | -21 | 14E | 46 | 11E | 12.0 | 102 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.