Daily Sunspot Evaluation
Observation Sheet Saturday, 13 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)
- 4
- Number of spots (f)
- 52
- Relative number (R)
- 92
- Observer
- MB
- Reading
- all checks consistent
- File
- 19970913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EAI – 21 | 23 | 30W | 319 | 32W | 14 | 23 |
| 2 | DKO – 4 | 27 | 62E | 227 | 60E | 3 | 25 |
| 3 | DKO – 5 | -27 | 66W | 355 | 68W | 10 | 22 |
| 4 | FKC – 22 | -25 | 04W | 293 | 06W | 18 | 24 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.