Daily Sunspot Evaluation
Observation Sheet Sunday, 9 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)
- 11
- Number of spots (f)
- 24
- Relative number (R)
- 134
- Observer
- HE
- Reading
- all checks consistent
- File
- 19900909.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 16 | 79W | 331 | 82W | 2 | 401 |
| 2 | HA – 1 | 14 | 69W | 321 | 72W | 2 | 405 |
| 3 | BXO – 5 | 22 | 34W | 286 | 37W | 4 | 417 |
| 4 | HA – 5 | 4 | 13W | 265 | 16W | 4 | 409 |
| 5 | HS – 1 | 13 | 17E | 235 | 14E | 2.5 | 412 |
| 6 | HS – 2 | 7 | 38E | 214 | 35E | 1 | 414 |
| 7 | HA – 2 | 18 | 49E | 203 | 46E | 1.5 | 416 |
| 8 | BRI – 4 | -15 | 66W | 318 | 69W | 8 | 408 |
| 9 | AR – 1 | -13 | 37W | 289 | 40W | 0.5 | 410 |
| 10 | AX – 1 | -21 | 00 | 252 | 03E | - | 418 |
| 11 | ? – 1 | -9 | 79W | 331 | 82W | 2 | 419 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.