Daily Sunspot Evaluation
Observation Sheet Thursday, 17 September 1992
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)
- 7
- Number of spots (f)
- 50
- Relative number (R)
- 120
- Observer
- TA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19920917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKI – 35 | 42W | 265 ⚠ | 45W | 8? | 320 | |
| 2 | BXO – 4 | 10 | .05W | 26 | 11W | 4 | 333 |
| 3 | ? – 3 | -18 | 80W | 298 | 83W | - | 321 |
| 4 | HA – 1 | -14 | 04W | 222 | 07W | 1.5 | 324 |
| 5 | AX – 2 | -18 | 10E | 208 | 07E | - | 335 |
| 6 | HA – 1 | -15 | 53E | 165 | 50E | 2 | 330 |
| 7 | AX – 4 | -8 | 55E | 163 | 52E | 1.5 | 331 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.