Daily Sunspot Evaluation
Observation Sheet Monday, 23 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)
- 111
- Relative number (R)
- 231
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19900423.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKO – 17 | 32 | 48W | 338 | 51W | 12 | 158 |
| 2 | CAI – 15 | 21 | 36W | 326 | 39W | 9 | 167 |
| 3 | BXO – 5 | 11 | 22E | 268 | 19E | 8.5 | 171 |
| 4 | BRO – 8 | 15 | 26E | 264 | 23E | 7.5 | 175 |
| 5 | CAO – 3 | 27 | 41E | 249 | 38E | 7.5 | 176 |
| 6 | ? – 2 | 11 | 77E | 213 | 74E | 2 | 179 |
| 7 | ? – 2 | -33 | 72W | 2 | 75W | 5 | 160 |
| 8 | CAI – 20 | -13 | 44W | 334 | 47W | 10 | 161 |
| 9 | CAI – 17 | -14 | 30W | 320 | 33W | 9 | 172 |
| 10 | HK – 9 | -20 | 22W | 312 | 25W | 3.5 | 170 |
| 11 | BXO – 9 | -9 | 36E | 254 | 33E | 7 | 174 |
| 12 | ? – 4 | -6 | 80E | 210 | 77E | 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.