Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 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)
- 210
- Relative number (R)
- 410
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19910821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 23 | 41°W | 46 | 43°W | 1.5 | 436 |
| 2 | CAI – 14 | 10 | 10°E | 355 | 07°E | 6° | 440 |
| 3 | CKI – 15 | 2 | 11°E | 354 | 08°E | 8° | 443 |
| 4 | AX – 1 | 18 | 13°E | 352 | 10°E | - | 461 |
| 5 | AX – 1 | 5 | 18°E | 347 | 15°E | - | 462 |
| 6 | DAO – 6 | 17 | 24°E | 341 | 21°E | 5.5 | 456 |
| 7 | HA – 1 | 1 | 26°E | 339 | 23°E | 1.5 | 454 |
| 8 | DKI – 24 | 12 | 30°E | 335 | 27°E | 8.5 | 455 |
| 9 | AR – 3 | 13 | 58°E | 307 | 55°E | 2.5 | 460 |
| 10 | HA – 3 | -5 | 45°W | 50 | 48°W | 3° | 438 |
| 11 | EAI – 10 | -20 | 40°W | 45 | 43°W | 12° | 445 |
| 12 | EKC – 60 | -18 | 23°W | 28 | 26°W | 11° | 440 |
| 13 | DAI – 12 | -10 | 20°W | 25 | 23°W | 8° | 441 |
| 14 | EKI – 38 | -10 | 06°W | 11 | 09°W | 12.5 | 447 |
| 15 | HA – 3 | -2 | 02°E | 3 | 01°W | 2.5 | 448 |
| 16 | HA – 1 | -17 | 04°E | 1 | 01°E | 1° | 452 |
| 17 | BXI – 9 | -14 | 08°E | 357 | 05°E | 5° | 450 |
| 18 | HA – 3 | -27 | 11°E | 354 | 08°E | 3° | 451 |
| 19 | AX – 2 | -18 | 12°E | 352 | 10°E | 1° | 458 |
| 20 | AX – 3 | -5 | 40°E | 325 | 37°E | 2° | 459 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.