Daily Sunspot Evaluation
Observation Sheet Saturday, 28 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)
- 13
- Number of spots (f)
- 92
- Relative number (R)
- 222
- Observer
- YK
- Reading
- all checks consistent
- File
- 19910928.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 9 | 86W | 310 | 89W | - | 521 |
| 2 | BXO – 3 | 12 | 56W | 280 | 59W | 6 | 537 |
| 3 | AX – 1 | 16 | 09W | 233 | 12W | - | 542 |
| 4 | AX – 1 | 14 | 08W | 232 | 11W | - | 543 |
| 5 | AX – 1 | 25 | 05W | 229 | 08W | - | 544 |
| 6 | AX – 1 | 17 | 74E | 150 | 71E | 0.5 | 545 |
| 7 | AX – 1 | 8 | 81E | 143 | 78E | 1 | 546 |
| 8 | AX – 2 | -29 | 58W | 282 | 61W | 2.5 | 547 |
| 9 | BRO – 8 | -10 | 33W | 257 | 36W | 10 | 529 |
| 10 | AX – 1 | -21 | 15E | 209 | 12E | - | 535 |
| 11 | EAO – 21 | -7 | 25E | 199 | 22E | 14.5 | 536 |
| 12 | FKO – 39 | -11 | 42E | 182 | 39E | 21.5 | 539 |
| 13 | CAI – 12 | -19 | 53E | 171 | 50E | 6 | 540 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.