Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 April 1984
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)
- 2
- Number of spots (f)
- 29
- Relative number (R)
- 49
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19840417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKI – 16 | 9 | 17W | 143 | 18W | 8 | 72 |
| 2 | DKI – 13 | -16 | 43E | 83 | 42E | 325 | 73 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.