Daily Sunspot Evaluation
Observation Sheet Friday, 28 June 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)
- 81
- Relative number (R)
- 211
- Observer
- MB
- Reading
- all checks consistent
- File
- 19910628.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 23 | 49W | 48 | 52W | 2 | 310 |
| 2 | AR – 1 | 18 | 03E | 356 | 00 | 0.5 | 334 |
| 3 | DKC – 24 | 5 | 06E | 353 | 03E | 9.5 | 324 |
| 4 | HA – 10 | 3 | 30E | 329 | 27E | 4.5 | 325 |
| 5 | CKO – 4 | 11 | 68E | 291 | 65E | 9 | 331 |
| 6 | HA – 1 | 19 | 80E | 279 | 77E | 2 | 335 |
| 7 | AX – 1 | -16 | 59W | 58 | 62W | - | 314 |
| 8 | AX – 1 | -14 | 08W | 7 | 11W | - | 336 |
| 9 | CAO – 3 | -4 | 06W | 5 | 09W | 6 | 330 |
| 10 | EKI – 30 | -7 | 06E | 353 | 03E | 12.5 | 327 |
| 11 | AX – 2 | -27 | 15E | 344 | 12E | 1 | 337 |
| 12 | AX – 1 | -6 | 16E | 343 | 13E | - | 323 |
| 13 | AX – 1 | -9 | 22E | 337 | 19E | - | 328 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.