Daily Sunspot Evaluation
Observation Sheet Thursday, 4 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)
- 19
- Number of spots (f)
- 128
- Relative number (R)
- 318
- Observer
- HE
- Reading
- all checks consistent
- File
- 19910704.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 6 | 5 | 75W | 355 | 78W | 9 | 324 |
| 2 | HA – 1 | 3 | 53W | 333 | 56W | 2.5 | 325 |
| 3 | CAI – 37 | 10 | 01W | 281 | 04W | 17.5 | 331 |
| 4 | HS – 1 | 19 | 01E | 279 | 02W | 1 | 335 |
| 5 | CAI – 17 | 14 | 23E | 257 | 20E | 7 | 342 |
| 6 | DAO – 7 | 21 | 38E | 242 | 35E | 10 | 344 |
| 7 | FAO – 20 | 27 | 42E | 238 | 39E | 18 | 342 |
| 8 | DAO – 5 | 34 | 58E | 222 | 55E | 5 | 348 |
| 9 | HK – 4 | 12 | 69E | 211 | 66E | 4 | 350 |
| 10 | ? – 7 | -7 | 79W | 359 | 82W | 12 | 327 |
| 11 | CAO – 4 | -28 | 63W | 343 | 66W | 5.5 | 352 |
| 12 | BRI – 4 | -33 | 44W | 324 | 41W | 4.5 | 345 |
| 13 | CAO – 7 | -12 | 01E | 279 | 02W | 10.5 | 346 |
| 14 | AX – 1 | -7 | 26E | 254 | 23E | - | 353 |
| 15 | HS – 2 | -12 | 27E | 253 | 24E | 2.5 | 347 |
| 16 | BXO – 2 | -16 | 33E | 249 | 30E | 6 | 348 |
| 17 | HA – 1 | -18 | 64E | 216 | 61E | 1.5 | 351 |
| 18 | AX – 1 | -14 | 70E | 210 | 67E | - | 354 |
| 19 | AX – 1 | -3 | 82E | 198 | 79E | - | 355 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.