Daily Sunspot Evaluation
Observation Sheet Monday, 9 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)
- 7
- Number of spots (f)
- 28
- Relative number (R)
- 98
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19900409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 32 | 64W | 178 | 65W | - | 145 |
| 2 | CKI – 9 | 21 | 45W | 159 | 46W | 13 | 143 |
| 3 | AR – 4 | 23 | 12E | 102 | 11E | 2 | 148 |
| 4 | BXO – 5 | 15 | 32E | 82 | 31E | 3.5 | 153 |
| 5 | HA – 1 | 31 | 38E | 76 | 37E | 2 | 151 |
| 6 | HS – 1 | -8 | 67W | 181 | 68W | 1 | 141 |
| 7 | BXO – 7 | -42 | 34E | 80 | 33E | 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.