Daily Sunspot Evaluation
Observation Sheet Sunday, 28 September 1997
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)
- 1
- Number of spots (f)
- 13
- Relative number (R)
- 23
- Observer
- TA
- Reading
- all checks consistent
- File
- 19970928.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EAO – 13 | -30 | 33W | 125 | 36W | 10.5 | 76 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.