Daily Sunspot Evaluation
Observation Sheet Thursday, 26 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)
- 78
- Relative number (R)
- 148
- Observer
- MB
- Reading
- all checks consistent
- File
- 19910926.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 11 | 9 | 53W | 303 | 56W | 6.5 | 52 |
| 2 | CAI – 15 | 1 | 29W | 279 | 32W | 6 | 53 |
| 3 | CAO – 12 | -10 | 06W | 256 | 09W | 9 | 529 |
| 4 | AX – 1 | -20 | 41E | 209 | 38E | - | 535 |
| 5 | EAO – 14 | -7 | 52E | 198 | 49E | 16 | 536 |
| 6 | FKO – 23 | -12 | 69E | 181 | 66E | 21.5 | 539 |
| 7 | ? – 2 | -19 | 78E | 172 | 75E | - | 540 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.