Daily Sunspot Evaluation
Observation Sheet Saturday, 7 September 1991
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)
- 8
- Number of spots (f)
- 86
- Relative number (R)
- 166
- Observer
- TA
- Reading
- all checks consistent
- File
- 19910907.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKO – 21 | -20 | 61W | 202 | 64W | 19 | 477 |
| 2 | BRO – 2 | -7 | 57W | 198 | 60W | 5.5 | 434 |
| 3 | AX – 1 | -23 | 48W | 189 | 57W | - | 483 |
| 4 | EKI – 44 | -11 | 42W | 183 | 45W | 11.5 | 430 |
| 5 | AX – 2 | -11 | 16E | 125 | 13E | 1.5 | 415 |
| 6 | BXI – 13 | -11 | 25E | 116 | 02E | 6 | 413 |
| 7 | HS – 1 | -25 | 39E | 102 | 36E | 2 | 492 |
| 8 | ? – 2 | -5 | 80E | 61 | 77E | 5 | 496 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.