Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 September 1983
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)
- 3
- Number of spots (f)
- 9
- Relative number (R)
- 39
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19830913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 4 | -7 | 37W | 146 | 41W | 75 | 277 |
| 2 | AXX – 1 | -21 | 28W | 137 | 32W | - | 280 |
| 3 | EBXI – 4 | -15 | 47E | 62 | 43E | 35 | 282 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.