Daily Sunspot Evaluation
Observation Sheet Friday, 17 August 1990
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)
- 135
- Relative number (R)
- 325
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19900817.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 9 | 0 | 60W | 256 | 63W | 8 | 370 |
| 2 | CAI – 3 | 13 | 46W | 242 | 49W | 2 | 357 |
| 3 | DKC – 23 | 13 | 34W | 230 | 37W | 10 | 359 |
| 4 | BRI – 17 | 3 | 18W | 214 | 21W | 9 | 365 |
| 5 | DSI – 6 | 17 | 10W | 206 | 13W | 9 | 362 |
| 6 | BRI – 12 | 7 | 03W | 199 | 06W | 6 | 378 |
| 7 | AX – 1 | 18 | 02E | 194 | 01W | - | 375 |
| 8 | CAI – 5 | 23 | 14E | 182 | 11E | 5 | 368 |
| 9 | HK – 3 | 10 | 45E | 151 | 42E | 4.5 | 371 |
| 10 | BXO – 8 | 13 | 66E | 130 | 63E | 7 | 376 |
| 11 | AX – 3 | -14 | 60W | 256 | 63W | 2 | 354 |
| 12 | CAI – 8 | -10 | 52W | 248 | 55W | 9 | 340 |
| 13 | AX – 1 | -17 | 14W | 210 | 17W | - | 329 |
| 14 | AX – 8 | -2 | 11W | 207 | 14W | 3 | 365 |
| 15 | BXI – 7 | -16 | 01E | 195 | 02W | 6 | 367 |
| 16 | AR – 3 | -18 | 29E | 167 | 26E | 2.5 | 382 |
| 17 | BRI – 11 | -11 | 30E | 166 | 27E | 11 | 372 |
| 18 | HH – 4 | -30 | 37E | 159 | 34E | 4 | 373 |
| 19 | BXI – 3 | -17 | 73E | 123 | 70E | 6 | 381 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.