Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 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)
- 4
- Number of spots (f)
- 57
- Relative number (R)
- 97
- Observer
- ıH
- Reading
- all checks consistent
- File
- 19970521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSO – 13 | 28 | 60W | 71 | 63W | 10 | 28 |
| 2 | EAO – 41 | 5 | 04W | 15 | 07W | 10 | 27 |
| 3 | AX – 2 | 2 | 10E | 1 | 07E | 1 | 30 |
| 4 | HS – 1 | -34 | 63E | 308 | 60E | 1 | 29 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.