Daily Sunspot Evaluation
Observation Sheet Thursday, 15 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)
- 6
- Number of spots (f)
- 34
- Relative number (R)
- 94
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19990415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | -16 | 51W | 263 | 54W | 0.5 | |
| 2 | HR – 1 | -27 | 34W | 246 | 37W | 1 | |
| 3 | HR – 3 | -33 | 23W | 235 | 26W | 3 | |
| 4 | CRO – 8 | -34 | 20W | 232 | 23W | 8 | |
| 5 | CRI – 14 | -19 | 08W | 220 | 11W | 5 | |
| 6 | CAO – 7 | -20 | 69E | 143 | 66E | 0.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.