Daily Sunspot Evaluation
Observation Sheet Friday, 7 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)
- 7
- Number of spots (f)
- 107
- Relative number (R)
- 177
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810807.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HKX – 6 | 15 | 68W | 221 | 71W | 4 | |
| 2 | AXX – 2 | 21 | 64W | 217 | 67W | - | |
| 3 | SHI – 7 | 10 | 29E | 124 | 26E | 9 | |
| 4 | CAO – 5 | 24 | 64E | 89 | 61E | 6 | |
| 5 | BXO – 16 | -25 | 09E | 144 | 06E | 10 | |
| 6 | FKC – 69 | -10 | 37E | 116 | 34E | 20 | |
| 7 | AXX – 2 | -12 | 70E | 83 | 67E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.