Daily Sunspot Evaluation
Observation Sheet Wednesday, 22 April 1981
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)
- 8
- Number of spots (f)
- 94
- Relative number (R)
- 174
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810422.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HSX – 1 | 24 | 51W | 179 | 54W | 1 | |
| 2 | AXX – 4 | 19 | 45W | 173 | 48W | 3.5 | |
| 3 | CSO – 6 | 8 | 28W | 156 | 31W | 4.5 | |
| 4 | HKI – 36 | 15 | 20W | 148 | 23W | 7.5EE | |
| 5 | CRI – 27 | 25 | 15W | 143 | 18W | 10 | |
| 6 | ? – 6 | -7 | 66W | 194 | 69W | 10 | |
| 7 | CAI – 8 | -10 | 18W | 146 | 21W | 4.75 | |
| 8 | BXI – 6 | -19 | 25E | 103 | 22E | 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.