Daily Sunspot Evaluation
Observation Sheet Thursday, 25 July 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)
- 18
- Number of spots (f)
- 155
- Relative number (R)
- 335
- Observer
- HE
- Reading
- counts consistent, some coordinates doubtful
- File
- 19910725.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 3 | 22 | 46W | 48 | 49W | 4.5 | 381 |
| 2 | HS – 7 | 1 | 25E | 337 | 22E | 4.5 | 304 |
| 3 | DHC – 52 | 9 | 26E | 336 | 23E | 15 | 313 |
| 4 | BRO – 3 | -23 | 62W | 64 | 65W | 2.5 | 380 |
| 5 | AR – 4 | -2 | 62W | 64 | 63W | 2 | 395 |
| 6 | DAI – 20 | -11 | 49W | 21 ⚠ | 22W | 10 | 385 |
| 7 | AR – 4 | -11 | 41W | 13 ⚠ | 14W | 2 | 396 |
| 8 | AX – 1 | -6 | 42W | 14 ⚠ | 15W | - | 404 |
| 9 | BRI – 11 | -7 | 05W | 7 | 08W | 6.5 | 350 |
| 10 | AX – 1 | -7 | 04E | 358 | 01E | - | 405 |
| 11 | ESI – 15 | -15 | 06E | 356 | 03E | 10.5 | 391 |
| 12 | BRI – 6 | -20 | 07E | 355 | 04E | 6 | 402 |
| 13 | AX – 1 | -9 | 15E | 347 | 12E | - | 466 |
| 14 | BRO – 4 | -26 | 16E | 344 | 15E | 2.5 | 374 |
| 15 | AX – 3 | -20 | 50E | 312 | 47E | 1 | 401 |
| 16 | ? – 1 | -18 | 85E | 277 | 82E | 2 | 457 |
| 17 | HS – 1 | 6 | 01E | 1 | 02W | 2 | 387 |
| 18 | HK – 18 | 9 | 08E | 354 | 05W | 7 | 388 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.