Daily Sunspot Evaluation
Observation Sheet Thursday, 17 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)
- 6
- Number of spots (f)
- 75
- Relative number (R)
- 135
- Observer
- MB
- Reading
- all checks consistent
- File
- 19911017.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 7 | 43W | 16 | 46W | 2 | 565 |
| 2 | BXO – 3 | 16 | 28W | 1 | 31W | 3.5 | 568 |
| 3 | CKI – 25 | 22 | 35E | 298 | 32E | 13 | 575 |
| 4 | DKI – 18 | -23 | 37W | 10 | 40W | 5 | 562 |
| 5 | DAO – 11 | -3 | 07W | 340 | 10W | 7 | 563 |
| 6 | BRI – 17 | -21 | 00 | 333 | 03W | 12 | 571 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.