Daily Sunspot Evaluation
Observation Sheet Sunday, 5 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)
- 10
- Number of spots (f)
- 83
- Relative number (R)
- 183
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810405.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSI – 11 | 14 | 28W | 20 | 30W | 8.5 | |
| 2 | CHO – 9 | 18 | 05E | 347 | 03E | 7.25 | |
| 3 | DAI – 14 | 5 | 20E | 332 | 18E | 6.5 | |
| 4 | AXX – 1 | 28 | 21E | 331 | 19E | - | |
| 5 | HAX – 5 | 8 | 39E | 313 | 37E | 4.5 | |
| 6 | DAC – 11 | 9 | 52E | 300 | 50E | 13 | |
| 7 | AXX – 1 | 12 | 53E | 299 | 51E | - | |
| 8 | ERC – 26 | 19 | 67E | 285 | 65E | 20 | |
| 9 | AXX – 1 | -3 | 21W | 13 | 23W | - | |
| 10 | BXO – 4 | -17 | 13E | 339 | 11E | 4.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.