Daily Sunspot Evaluation
Observation Sheet Friday, 21 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)
- 10
- Number of spots (f)
- 123
- Relative number (R)
- 223
- Observer
- HÇ
- Reading
- all checks consistent
- File
- 19890421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXS – 13 | 29 | 56W | 149 | 57W | 9.5 | 156 |
| 2 | HA – 2 | 16 | 48W | 141 | 49W | 1.5 | 158 |
| 3 | FKC – 45 | 10 | 34W | 127 | 35W | 17 | 160 |
| 4 | CSO – 11 | 18 | 13E | 80 | 12E | 12.5 | 162 |
| 5 | HK – 3 | 32 | 50E | 43 | 49E | 4.5 | 164 |
| 6 | CKI – 9 | -21 | 66W | 159 | 67W | 13 | 166 |
| 7 | BRI – 11 | -10 | 30W | 123 | 31W | 6.5 | 168 |
| 8 | CAI – 17 | -18 | 12E | 81 | 11E | 11 | 170 |
| 9 | HH – 11 | -23 | 26E | 67 | 25E | 7 | 172 |
| 10 | AR – 1 | -19 | 58E | 35 | 57E | 0.5 | 174 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.