Daily Sunspot Evaluation
Observation Sheet Thursday, 11 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)
- 15
- Number of spots (f)
- 95
- Relative number (R)
- 245
- Observer
- HE
- Reading
- all checks consistent
- File
- 19910711.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 5 | 16 | 70W | 258 | 73W | 5 | 342 |
| 2 | AR – 1 | 21 | 62W | 250 | 65W | 0.5 | 344 |
| 3 | DKC – 17 | 35 | 32W | 220 | 35W | 7.5 | 349 |
| 4 | HK – 13 | 12 | 23W | 211 | 26W | 4 | 350 |
| 5 | AR – 1 | 20 | 15E | 173 | 12E | - | 360 |
| 6 | HA – 1 | -12 | 65W | 253 | 68W | 2 | 347 |
| 7 | AR – 1 | -17 | 28W | 216 | 31W | 0.5 | 351 |
| 8 | AR – 1 | -18 | 19W | 207 | 22W | 0.5 | 372 |
| 9 | AX – 1 | -1 | 15W | 203 | 18W | - | 373 |
| 10 | BXO – 6 | -1 | 06W | 194 | 09W | 4 | 390 |
| 11 | AX – 3 | -25 | 07E | 181 | 04E | 1 | 374 |
| 12 | AX – 1 | -16 | 12E | 176 | 09E | - | 375 |
| 13 | FKI – 33 | -24 | 24E | 164 | 21E | 20.5 | 358 |
| 14 | HA – 5 | -11 | 48E | 140 | 45E | 4 | 365 |
| 15 | BRI – 6 | -16 | 51E | 137 | 48E | 7.5 | 371 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.