Daily Sunspot Evaluation
Observation Sheet Sunday, 19 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)
- 14
- Number of spots (f)
- 147
- Relative number (R)
- 287
- Observer
- OG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810419.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EAC – 12 | 14 | 68W | 234 | 69W | 12 | |
| 2 | CAI – 10 | 10 | 56W | 222 | 57W | 7.5 | |
| 3 | DSO – 2 | 18 | 53W | 219 | 54W | 9 | |
| 4 | CAO – 4 | 15 | 43W | 209 | 49W | 8 | |
| 5 | CSI – 10 | 25 | 39W | 205 | 40W | 6 | |
| 6 | CAI – 6 | 23 | 11W | 177 | 12W | 5.5 | |
| 7 | CSI – 6 | 19 | 06W | 172 | 07W | 5 | |
| 8 | CAI – 3 | 12 | 02E | 164 | 01E | 4.5 | |
| 9 | DAI – 12 | 9 | 09E | 157 | 08E | 4 | |
| 10 | DAC – 21 | 15 | 16E | 150 | 15E | 6.5 | |
| 11 | DRO – 12 | 25 | 21E | 145 | 20E | 9 | |
| 12 | AXX – 1 | -3 | 63E | 229 ⚠ | 64W | ||
| 13 | DKC – 31 | -6 | 28W | 194 | 29W | 10 | |
| 14 | CKO – 17 | -9 | 22E | 144 | 21E | 11 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.