Daily Sunspot Evaluation
Observation Sheet Saturday, 11 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)
- 8
- Number of spots (f)
- 56
- Relative number (R)
- 136
- Observer
- SM
- Reading
- all checks consistent
- File
- 19810711.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXX – 1 | 22 | 25W | 174 | 27W | ||
| 2 | BXI – 7 | 21 | 30E | 119 | 28E | 4 | |
| 3 | BXO – 5 | 22 | 41E | 108 | 39E | 35 | |
| 4 | BXO – 2 | 13 | 44E | 105 | 42E | 3 | |
| 5 | CAO – 7 | -7 | 25W | 174 | 27W | 6 | |
| 6 | CAO – 2 | -10 | 19E | 130 | 17E | 5 | |
| 7 | EAC – 17 | -8 | 50E | 99 | 48E | 14 | |
| 8 | HKC – 15 | -28 | 48E | 101 | 46E | 8 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.