Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 September 1988
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)
- 51
- Relative number (R)
- 181
- Observer
- HG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19880921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 2 | 19 | 13W | 21 | 19W | 2.5 | 244 |
| 2 | BXO – 4 | 20 | 03W | 11 | 01W | 2 | 242 |
| 3 | BXO – 3 | 24 | 16E | 252 ⚠ | 14E | 4 | 238 |
| 4 | BR – 7 | 29 | 52E | 316 | 50E | 7 | 237 |
| 5 | BXO – 4 | 27 | 51E | 317 | 49E | 4 | 239 |
| 6 | AX – 1 | 17 | 62E | 306 | 60E | - | 243 |
| 7 | HX – 2 | 23 | 67E | 301 | 65E | 3 | 240 |
| 8 | BXO – 3 | -18 | 59W | 67 | 61W | 5 | 234 |
| 9 | HH – 1 | -11 | 58W | 63 | 57W | 3 | 223 |
| 10 | CAR – 9 | -15 | 15E | 353 | 13E | 6 | 230 |
| 11 | HA – 3 | -35 | 22E | 346 | 20E | 3 | 232 |
| 12 | BR – 10 | -36 | 24E | 324 ⚠ | 22E | 8 | 236 |
| 13 | AX – 2 | -39 | 51E | 317 | 49E | 1 | 241 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.