Daily Sunspot Evaluation
Observation Sheet Saturday, 17 April 1999
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)
- 7
- Number of spots (f)
- 42
- Relative number (R)
- 112
- Observer
- HE
- Reading
- all checks consistent
- File
- 19990417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 5 | 21 | 31W | 215 | 32W | 4 | |
| 2 | HR – 1 | 17 | 26W | 210 | 27W | 0.5 | |
| 3 | HR – 1 | -28 | 62W | 246 | 63W | 1 | |
| 4 | ERI – 15 | -34 | 49W | 233 | 50W | 11 | |
| 5 | GRO – 9 | -19 | 37W | 221 | 38W | 6 | |
| 6 | CSO – 9 | -20 | 38E | 146 | 37E | 9 | |
| 7 | ? – 2 | -14 | 76E | 108 | 75E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.