Daily Sunspot Evaluation
Observation Sheet Friday, 12 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)
- 10
- Number of spots (f)
- 116
- Relative number (R)
- 216
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910712.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 18 | 36 | 46W | 221 | 49W | 10 | 349 |
| 2 | CAO – 11 | 12 | 36W | 211 | 39W | 5 | 350 |
| 3 | BXO – 6 | 20 | 02W | 177 | 05W | 6 | 360 |
| 4 | ? – 1 | -13 | 77W | 252 | 80W | 2 | 341 |
| 5 | AR – 2 | -18 | 41W | 216 | 44W | 1 | 351 |
| 6 | AX – 3 | -25 | 06W | 181 | 09W | 1 | 374 |
| 7 | FKI – 40 | -24 | 12E | 163 | 09E | 20 | 358 |
| 8 | HA – 4 | -11 | 35E | 140 | 32E | 2.5 | 365 |
| 9 | DAI – 29 | -16 | 38E | 137 | 35E | 9.5 | 373 |
| 10 | AX – 2 | -4 | 70E | 105 | 67E | 2 | 376 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.