Daily Sunspot Evaluation
Observation Sheet Saturday, 7 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)
- 9
- Number of spots (f)
- 47
- Relative number (R)
- 137
- Observer
- HE
- Reading
- all checks consistent
- File
- 19900407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRI – 10 | 30 | 41W | 182 | 44W | 5 | 145 |
| 2 | EAC – 13 | 20 | 18W | 159 | 21W | 13 | 143 |
| 3 | CSO – 5 | 23 | 36E | 105 | 33E | 9.5 | 148 |
| 4 | AX – 1 | 19 | 49E | 92 | 46E | 0.5 | 149 |
| 5 | HA – 1 | 30 | 65E | 76 | 62E | 2 | 151 |
| 6 | HS – 1 | -8 | 39W | 180 | 42W | 1 | 141 |
| 7 | AX – 2 | -25 | 10W | 151 | 13W | 1 | 144 |
| 8 | BXI – 8 | -19 | 05W | 146 | 08W | 4.5 | 150 |
| 9 | CAO – 6 | -42 | 60E | 81 | 57E | 10 | 152 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.