Daily Sunspot Evaluation
Observation Sheet Thursday, 5 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)
- 10
- Number of spots (f)
- 69
- Relative number (R)
- 169
- Observer
- MB
- Reading
- all checks consistent
- File
- 19900405.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 26 | 75W | 244 | 78W | 2 | 136 |
| 2 | BRI – 15 | 31 | 15W | 184 | 18W | 9 | 145 |
| 3 | EHC – 32 | 20 | 07E | 162 | 04E | 13 | 143 |
| 4 | DAC – 7 | 23 | 65E | 104 | 62E | 9 | 148 |
| 5 | ? – 1 | 19 | 75E | 94 | 12E | 1.5 | 149 |
| 6 | AR – 1 | -16 | 83W | 252 | 86W | 1 | 140 |
| 7 | HA – 1 | -12 | 61W | 230 | 64W | 1 | 139 |
| 8 | HS – 1 | -8 | 11W | 180 | 14W | 1.5 | 141 |
| 9 | HA – 1 | -26 | 17E | 152 | 14E | 1.5 | 144 |
| 10 | AX – 9 | -19 | 23E | 146 | 20E | 3 | 150 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.