Daily Sunspot Evaluation
Observation Sheet Wednesday, 11 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)
- 7
- Number of spots (f)
- 64
- Relative number (R)
- 134
- Observer
- HE
- Reading
- all checks consistent
- File
- 19910911.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 16 | 3 | 14W | 100 | 15W | 9 | 438 |
| 2 | DAO – 10 | -12 | 29W | 115 | 30W | 7.5 | 438 |
| 3 | HS – 1 | -24 | 15W | 101 | 16W | 2 | 492 |
| 4 | BRO – 2 | -6 | 25E | 61 | 24E | 3 | 496 |
| 5 | HK – 16 | -20 | 40E | 46 | 39E | 7 | 499 |
| 6 | BRI – 18 | -20 | 58E | 28 | 57E | 16 | 500 |
| 7 | HA – 1 | -11 | 73E | 13 | 72E | 2 | 501 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.