Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 April 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)
- 17
- Relative number (R)
- 37
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19970415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EAI – 4 | -32 | 69W | 194 | 70W | 12 | 2.0 |
| 2 | CRE – 13 | -24 | 15E | 110 | 14E | 6 | 2.1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.