Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 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)
- 3
- Number of spots (f)
- 21
- Relative number (R)
- 51
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19970520.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 10 | 26 | 45W | 68 | 47W | 5 | 28 |
| 2 | CSO – 10 | 4 | 09E | 14 | 07E | 9 | 27 |
| 3 | ? – 1 | -34 | 77E | 306 | 75E | 29 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.