Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 33
- Relative number (R)
- 103
- Observer
- TA
- Reading
- all checks consistent
- File
- 19990413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 4 | 20 | 47W | 285 | 49W | 4.5 | |
| 2 | AX – 2 | 13 | 35W | 273 | 37W | 2 | |
| 3 | CAO – 3 | -17 | 23W | 261 | 25W | 8 | |
| 4 | CAI – 3 | -27 | 07W | 245 | 07W | 3 | |
| 5 | DAO – 7 | -34 | 04E | 234 | 02E | 4.5 | |
| 6 | ORI – 9 | -19 | 05E | 233 | 01E | 6 | |
| 7 | CRO – 5 | -20 | 16E | 222 | 14E | 3.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.