Daily Sunspot Evaluation
Observation Sheet Thursday, 20 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)
- 9
- Number of spots (f)
- 102
- Relative number (R)
- 192
- Observer
- YK
- Reading
- all checks consistent
- File
- 19890420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BKI – 7 | 29 | 41W | 149 | 44W | 7 | 156 |
| 2 | HS – 3 | 15 | 32W | 140 | 35W | 1.5 | 122 |
| 3 | FKC – 38 | 10 | 18W | 126 | 21W | 17.5 | 133 |
| 4 | DAO – 9 | 18 | 28E | 80 | 25E | 9 | 146 |
| 5 | HK – 3 | 33 | 67E | 41 | 64E | 6 | 186 |
| 6 | EKI – 17 | -22 | 50W | 158 | 53W | 14.5 | |
| 7 | CAI – 15 | -18 | 28E | 80 | 25E | 11.5 | 174 |
| 8 | HH – 9 | -22 | 43E | 65 | 40E | 9 | |
| 9 | AR – 1 | -19 | 76E | 32 | 73E | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.