Daily Sunspot Evaluation
Observation Sheet Sunday, 12 July 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)
- 80
- Relative number (R)
- 180
- Observer
- SM
- Reading
- all checks consistent
- File
- 19810712.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 7 | 21 | 38W | 175 | 41W | 5 | |
| 2 | BXI – 5 | 12 | 24W | 161 | 24W | 4 | |
| 3 | BXI – 6 | 20 | 17E | 120 | 14E | 5 | |
| 4 | DAO – 7 | 22 | 27E | 110 | 24E | 6 | |
| 5 | AXX – 3 | 13 | 31E | 106 | 28E | 3 | |
| 6 | AXX – 1 | 13 | 70E | 67 | 67E | - | |
| 7 | CAI – 5 | -7 | 39W | 176 | 42W | 7 | |
| 8 | CAO – 2 | -10 | 07E | 130 | 04E | 6 | |
| 9 | EAC – 26 | -9 | 37E | 100 | 34E | 145 | |
| 10 | HKC – 18 | -29 | 35E | 102 | 32E | 8 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.