Daily Sunspot Evaluation
Observation Sheet Friday, 17 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)
- 13
- Number of spots (f)
- 182
- Relative number (R)
- 312
- Observer
- HÇ
- Reading
- all checks consistent
- File
- 19890217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 5 | 34 | 73W | 276 | 74W | 7.0 | 32 |
| 2 | DAO – 12 | 24 | 41W | 244 | 42W | 9.5 | 37 |
| 3 | CAO – 6 | 16 | 40W | 243 | 41W | 8.0 | 33 |
| 4 | AX – 1 | 18 | 30W | 233 | 31W | - | 38 |
| 5 | CAI – 14 | 29 | 04W | 207 | 05W | 7.5 | 34 |
| 6 | AX – 2 | 13 | 02E | 201 | 01E | 0.5 | 37 |
| 7 | EAI – 33 | 20 | 05E | 198 | 04E | 13.0 | 45 |
| 8 | BXO – 5 | 17 | 15E | 188 | 14E | 4.0 | 43 |
| 9 | AX – 4 | 31 | 17E | 186 | 16E | 3.0 | 46 |
| 10 | BXO – 5 | 18 | 69E | 134 | 68E | 7.0 | 39 |
| 11 | FKC – 60 | -18 | 39W | 242 | 40W | 18.0 | 32 |
| 12 | EKC – 18 | -12 | 40E | 163 | 39E | 11.0 | 32 |
| 13 | CAI – 17 | -21 | 57E | 146 | 56E | 10.0 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.