Daily Sunspot Evaluation
Observation Sheet Thursday, 10 October 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)
- 12
- Number of spots (f)
- 90
- Relative number (R)
- 210
- Observer
- MB
- Reading
- all checks consistent
- File
- 19911010.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 9 | 7 | 65W | 130 | 67W | 10 | 553 |
| 2 | CAI – 11 | 19 | 38W | 103 | 40W | 9.5 | 555 |
| 3 | BRO – 8 | 12 | 00 | 65 | 02W | 4.5 | 564 |
| 4 | BRI – 7 | 7 | 57E | 8 | 55E | 9.5 | 565 |
| 5 | AX – 4 | 1 | 63E | 2 | 61E | 1 | 566 |
| 6 | AR – 4 | 16 | 65E | 0 | 63E | 4 | 568 |
| 7 | AX – 2 | 6 | 70E | 355 | 68E | 0.5 | 569 |
| 8 | BXO – 5 | -14 | 61W | 126 | 63W | 5.5 | 570 |
| 9 | BRI – 7 | -16 | 10W | 75 | 12W | 7 | 567 |
| 10 | CAO – 13 | -10 | 06W | 71 | 08W | 7.5 | 560 |
| 11 | BXO – 8 | -11 | 46E | 19 | 44E | 3 | 561 |
| 12 | EKI – 12 | -23 | 60E | 5 | 58E | 13 | 562 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.