Daily Sunspot Evaluation
Observation Sheet Sunday, 23 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)
- 80
- Relative number (R)
- 170
- Observer
- YK
- Reading
- all checks consistent
- File
- 19890423.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 29 | 75W | 141 | 76W | 1 | 156 |
| 2 | AX – 1 | 14 | 74W | 140 | 79W | 0.5 | 155 |
| 3 | FKI – 21 | 10 | 59W | 125 | 60W | 19 | 154 |
| 4 | CAI – 13 | 17 | 19W | 85 | 20W | 7.5 | 153 |
| 5 | HK – 9 | 33 | 23E | 43 | 22E | 5 | 152 |
| 6 | DSO – 7 | -9 | 59W | 125 | 60W | 8 | 151 |
| 7 | BKO – 4 | -17 | 18W | 84 | 19W | 3 | 150 |
| 8 | HH – 12 | -22 | 02E | 64 | 01E | 9 | 149 |
| 9 | DSI – 12 | -18 | 33E | 33 | 32E | 8.5 | 148 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.