Daily Sunspot Evaluation
Observation Sheet Sunday, 9 August 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)
- 137
- Relative number (R)
- 217
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810809.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 13 | 15 | 32W | 157 | 34W | 5 | |
| 2 | CHI – 11 | 11 | 00 | 125 | 02W | 5.5 | |
| 3 | DAI – 9 | 25 | 37E | 88 | 35E | 7 | |
| 4 | BXI – 15 | -25 | 19W | 144 | 21W | 11 | |
| 5 | FKC – 82 | -10 | 08E | 117 | 06E | 20 | |
| 6 | AXX – 2 | -27 | 24E | 98 | 25E | 2 | |
| 7 | AXX – 3 | -12 | 39E | 86 | 37E | 2 | |
| 8 | ? – 2 | -10 | 71E | 54 | 69E | 3 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.