Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 April 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)
- 7
- Number of spots (f)
- 98
- Relative number (R)
- 168
- Observer
- MB
- Reading
- all checks consistent
- File
- 19890418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 3 | 16 | 70W | 204 | 73W | 9 | 181 |
| 2 | HS – 1 | 14 | 06W | 140 | 09W | 1.5 | 185 |
| 3 | FKI – 31 | 9 | 08E | 126 | 05E | 16.5 | 188 |
| 4 | CAI – 10 | 18 | 54E | 80 | 51E | 10 | 197 |
| 5 | EKI – 30 | -21 | 25W | 159 | 28W | 15 | 196 |
| 6 | EAI – 14 | -18 | 53E | 81 | 50E | 12 | 190 |
| 7 | HK – 9 | -23 | 68E | 66 | 65E | 5.5 | 194 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.