Daily Sunspot Evaluation
Observation Sheet Thursday, 16 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)
- 5
- Number of spots (f)
- 25
- Relative number (R)
- 75
- Observer
- NA
- Reading
- all checks consistent
- File
- 19980416.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 11 | 30 | 28W | 4 | 31W | 8 | 2731 |
| 2 | ? – 2 | -23 | 78W | 54 | 81W | - | 564 |
| 3 | CAO – 2 | -21 | 60W | 36 | 63W | 13 | 654 |
| 4 | AX – 1 | -25 | 45W | 21 | 48W | - | 2270 |
| 5 | CAO – 9 | -25 | 24W | 0 | 27W | 7 | 2068 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.