Daily Sunspot Evaluation
Observation Sheet Saturday, 17 May 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)
- 2
- Number of spots (f)
- 3
- Relative number (R)
- 23
- Observer
- HE
- Reading
- all checks consistent
- File
- 19970517.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 20 | 75W | 138 | 77W | - | 25 |
| 2 | AX – 1 | 4 | 49E | 14 | 47E | 0.5 | 27 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.