Daily Sunspot Evaluation
Observation Sheet Friday, 17 April 1998
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)
- 15
- Relative number (R)
- 55
- Observer
- TA
- Reading
- all checks consistent
- File
- 19980417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CRO – 6 | 30 | 44W | 4 | 44W | 9 | 2334 |
| 2 | BXO – 6 | 20 | 07E | 313 | 07E | 4 | 2372 |
| 3 | ? – 1 | -17 | 82W | 42 | 82W | - | 1264 |
| 4 | AX – 2 | -23 | 43W | 3 | 43W | 1 | 1068 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.