Daily Sunspot Evaluation
Observation Sheet Thursday, 9 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)
- 6
- Number of spots (f)
- 22
- Relative number (R)
- 82
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810709.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 8 | 04E | 172 | 01E | - | |
| 2 | HAX – 4 | 20 | 58E | 118 | 55E | 3 | |
| 3 | ? – 1 | -4 | 83W | 259 | 86W | / | |
| 4 | CAO – 5 | -10 | 51E | 125 | 48E | 3 | |
| 5 | ? – 6 | -28 | 74E | 99 | 74E | 8 | |
| 6 | ? – 5 | -9 | 78E | 98 | 75E | 14 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.