Daily Sunspot Evaluation
Observation Sheet Tuesday, 11 September 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)
- 29
- Relative number (R)
- 149
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19900911.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 3 | 22 | 57W | 283 | 60W | 2.5 | 417 |
| 2 | AR – 1 | 37 | 56W | 282 | 59W | 0.5 | 420 |
| 3 | HA – 2 | 5 | 40W | 266 | 43W | 2 | 409 |
| 4 | HA – 2 | 13 | 09W | 235 | 12W | 2.5 | 412 |
| 5 | HS – 1 | 7 | 12E | 214 | 09E | 1 | 414 |
| 6 | HA – 4 | 18 | 23E | 203 | 20E | 1.5 | 416 |
| 7 | ? – 1 | 9 | 77E | 149 | 74E | 3 | 423 |
| 8 | AX – 2 | -32 | 36E | 190 | 33E | 2 | 424 |
| 9 | AX – 2 | -18 | 42E | 184 | 39E | 2 | 425 |
| 10 | CAO – 9 | -10 | 56E | 170 | 53E | 8 | 419 |
| 11 | ? – 1 | -26 | 77E | 149 | 74E | - | 426 |
| 12 | ? – 1 | -13 | 80E | 146 | 77E | - | 429 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.