Daily Sunspot Evaluation
Observation Sheet Friday, 12 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)
- 3
- Number of spots (f)
- 62
- Relative number (R)
- 92
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19970912.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EAI – 28 | 22 | 18W | 320 | 20W | 13 | 73 |
| 2 | EAI – 10 | -28 | 53W | 355 | 55W | 11 | 72 |
| 3 | FKC – 24 | -26 | 10E | 292 | 08E | 19 | 74 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.