Daily Sunspot Evaluation
Observation Sheet Sunday, 17 November 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)
- 47
- Relative number (R)
- 117
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19911117.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 19 | 80W | 4 | 82W | - | 638 |
| 2 | CAI – 10 | 10 | 61W | 345 | 63W | 13.5 | 628 |
| 3 | AR – 1 | 6 | 59E | 225 | 57E | 1 | 635 |
| 4 | EKC – 25 | -11 | 36W | 320 | 38W | 11.5 | 630 |
| 5 | AR – 3 | -13 | 27W | 311 | 29W | 0.5 | 636 |
| 6 | BRI – 6 | -17 | 46E | 238 | 44E | 5.5 | 639 |
| 7 | ? – 1 | -10 | 85E | 199 | 83E | - | 640 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.