Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 August 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)
- 20
- Number of spots (f)
- 195
- Relative number (R)
- 395
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910820.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 23 | 28W | 47 | 31W | 1 | 436 |
| 2 | BXI – 8 | 9 | 15E | 4 | 12E | 5.5 | 453 |
| 3 | CAO – 10 | 10 | 24E | 355 | 21E | 7 | 444 |
| 4 | CKI – 6 | 3 | 24E | 355 | 21E | 7 | 442 |
| 5 | HA – 1 | 2 | 39E | 340 | 36E | 1.5 | 454 |
| 6 | CAO – 8 | 17 | 38E | 341 | 35E | 7 | 456 |
| 7 | DAI – 18 | 11 | 43E | 336 | 40E | 8.5 | 455 |
| 8 | AX – 1 | 12 | 72E | 307 | 69E | - | 460 |
| 9 | AR – 2 | -9 | 50W | 69 | 53W | 2 | 457 |
| 10 | HA – 2 | -8 | 30W | 49 | 33W | 2 | 458 |
| 11 | EAO – 10 | -20 | 26W | 45 | 29W | 12.5 | 445 |
| 12 | EKC – 50 | -18 | 10W | 29 | 13W | 11 | 440 |
| 13 | DKC – 16 | -9 | 08W | 27 | 11W | 8 | 441 |
| 14 | EAC – 33 | -10 | 07E | 12 | 04E | 13 | 447 |
| 15 | HA – 1 | -3 | 15E | 4 | 02E | 1 | 448 |
| 16 | CAI – 3 | -17 | 19E | 0 | 06E | 4 | 452 |
| 17 | BXI – 12 | -13 | 21E | 358 | 18E | 7 | 450 |
| 18 | HA – 3 | -27 | 22E | 357 | 19E | 3 | 451 |
| 19 | AX – 5 | -19 | 26E | 353 | 23E | 1.5 | 458 |
| 20 | BXI – 5 | -10 | 53E | 326 | 50E | 4.5 | 459 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.