Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 September 2004
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)
- 17
- Relative number (R)
- 47
- Observer
- ZFB
- Reading
- all checks consistent
- File
- 20040921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 4 | 6 | 77W | 352 | 80W | 6 | 165 |
| 2 | AX – 1 | 6 | 01E | 274 | 02W | - | 171 |
| 3 | DKO – 12 | -13 | 05E | 270 | 02E | 5.10 | 168 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.