Daily Sunspot Evaluation
Observation Sheet Monday, 18 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)
- 5
- Number of spots (f)
- 31
- Relative number (R)
- 81
- Observer
- AÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19830418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 6 | 6 | 30E | 236 | 27E | 4 | 91 |
| 2 | AXX – 1 | 6 | 40E | 226 | 37E | 92 | |
| 3 | DKC – 8 | -29 | 45W | 911 ⚠ | 49W | 7 | 93 |
| 4 | DAE – 7 | -7 | 19W | 285 | 22W | 575 | 94 |
| 5 | CAI – 9 | -11 | 07W | 273 | 10W | 45 | 95 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.