Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 April 1983
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)
- 27
- Relative number (R)
- 97
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19830413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 3 | 20 | 62E | 270 | 59E | 2 | 90 |
| 2 | CAI – 7 | -9 | 69W | 41 | 72W | 6 | 82 |
| 3 | CAO – 9 | -17 | 26W | 358 | 29W | 6 | 84 |
| 4 | HAX – 1 | -8 | 10W | 342 | 13W | 05 | 85 |
| 5 | ARO – 2 | -13 | 08W | 340 | 11W | 4 | 87 |
| 6 | CAI – 4 | -9 | 43E | 289 | 40E | 4 | 89 |
| 7 | HSX – 1 | -7 | 45E | 287 | 42E | 1 | 88 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.