Daily Sunspot Evaluation
Observation Sheet Sunday, 22 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)
- 10
- Number of spots (f)
- 70
- Relative number (R)
- 170
- Observer
- TA
- Reading
- all checks consistent
- File
- 19910922.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 2 | 58W | 1 | 61W | 2 | 502 |
| 2 | CAI – 16 | 8 | 44W | 347 | 47W | 13 | 505 |
| 3 | AR – 3 | 10 | 03E | 300 | 00 | 1 | 521 |
| 4 | BRO – 9 | 6 | 42E | 261 | 39E | 3 | 524 |
| 5 | HS – 1 | -12 | 72W | 15 | 75W | 2 | 501 |
| 6 | BRO – 5 | -27 | 64W | 7 | 67W | 2 | 530 |
| 7 | AX – 1 | -18 | 49W | 352 | 52W | - | 534 |
| 8 | CAI – 14 | -14 | 38W | 341 | 42W | 6 | 526 |
| 9 | BRO – 16 | -11 | 01W | 304 | 04W | 5.5 | 528 |
| 10 | AX – 4 | -11 | 49E | 254 | 46W | 2 | 523 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.