Daily Sunspot Evaluation
Observation Sheet Tuesday, 24 April 1990
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)
- 12
- Number of spots (f)
- 108
- Relative number (R)
- 228
- Observer
- YK
- Reading
- all checks consistent
- File
- 19900424.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKI – 19 | 34 | 60W | 337 | 62W | 8.5 | 158 |
| 2 | CAI – 14 | 21 | 50W | 327 | 52W | 9.5 | 167 |
| 3 | AX – 4 | 11 | 05E | 272 | 08E | 2 | 171 |
| 4 | BRI – 15 | 15 | 11E | 266 | 09E | 7 | 175 |
| 5 | CAO – 4 | 27 | 27E | 250 | 25E | 8.5 | 176 |
| 6 | HK – 3 | 11 | 63E | 214 | 61E | 3 | 179 |
| 7 | HK – 10 | -13 | 58W | 335 | 60W | 5.5 | 161 |
| 8 | CKI – 11 | -13 | 44W | 321 | 46W | 8 | 172 |
| 9 | HA – 13 | -19 | 35W | 312 | 37W | 2 | 170 |
| 10 | AX – 5 | -41 | 32W | 309 | 34W | 2.5 | 181 |
| 11 | BXI – 4 | -9 | 23E | 254 | 21E | 8.5 | 174 |
| 12 | DAC – 6 | -5 | 65E | 212 | 63E | 8 | 180 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.