Daily Sunspot Evaluation
Observation Sheet Friday, 20 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)
- 6
- Number of spots (f)
- 38
- Relative number (R)
- 98
- Observer
- TA
- Reading
- all checks consistent
- File
- 19910920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 6 | 60W | 27 | 61W | 0.5 | 524 |
| 2 | HS – 1 | 2 | 33W | 0 | 34W | 2 | 502 |
| 3 | CAI – 29 | 8 | 19W | 346 | 20W | 13 | 505 |
| 4 | AX – 1 | 18 | 13W | 340 | 14W | - | 525 |
| 5 | HS – 1 | -12 | 47W | 14 | 48W | 2 | 501 |
| 6 | BXO – 4 | -14 | 14W | 341 | 15W | 2.5 | 526 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.