Daily Sunspot Evaluation
Observation Sheet Sunday, 15 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)
- 14
- Number of spots (f)
- 83
- Relative number (R)
- 223
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 4 | 2 | 70W | 105 | 73W | 4.5 | 498 |
| 2 | AX – 4 | 14 | 21W | 56 | 24W | 2° | 504 |
| 3 | HA – 1 | 2 | 37E | 358 | 34E | 1.5 | 502 |
| 4 | DAC – 20 | 6 | 55E | 340 | 52E | 8° | 505 |
| 5 | AX – 4 | 10 | 66E | 329 | 63E | 3° | 510 |
| 6 | ? – 3 | -12 | 83W | 118 | 86W | 5° | 493 |
| 7 | HA – 1 | -25 | 64W | 99 | 67W | 1° | 492 |
| 8 | DAC – 15 | -20 | 11W | 46 | 14W | 6° | 499 |
| 9 | AX – 5 | -31 | 06W | 41 | 09W | 1° | 511 |
| 10 | AX – 2 | -27 | 02E | 33 | 01W | 0.5 | 512 |
| 11 | CAI – 12 | -21 | 05E | 30 | 02E | 8.5 | 500 |
| 12 | AX – 3 | -18 | 15E | 20 | 12E | 1° | 513 |
| 13 | HA – 1 | -11 | 21E | 14 | 18E | 1.5 | 501 |
| 14 | AX – 8 | -13 | 36E | 359 | 33E | 1.5 | 514 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.