Daily Sunspot Evaluation
Observation Sheet Friday, 6 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)
- 72
- Relative number (R)
- 172
- Observer
- SG0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19900406.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRI – 11 | 30 | 30W | 184 | 32W | 6 | 145 |
| 2 | EHC – 36 | 20 | 06W | 160 | 08W | 13.5 | 143 |
| 3 | CAI – 7 | 23 | 90E | 104 ⚠ | 48E | 9 | 148 |
| 4 | AX – 1 | 19 | 62E | 92 | 60E | - | 149 |
| 5 | ? – 1 | 31 | 79E | 77 | 75E | 4 | 151 |
| 6 | AR – 1 | -12 | 75W | 229 | 79E | 0.5 | 139 |
| 7 | HS – 1 | -8 | 23W | 181 ⚠ | 29W | 1.5 | 141 |
| 8 | AR – 3 | -26 | 02E | 152 | 00 | 1.5 | 144 |
| 9 | BRO – 9 | -20 | 08E | 146 | 06E | 3.5 | 150 |
| 10 | CAO – 2 | -43 | 70E | 84 | 68E | 9 | 152 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.