Daily Sunspot Evaluation
Observation Sheet Sunday, 16 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)
- 10
- Number of spots (f)
- 70
- Relative number (R)
- 170
- Observer
- HM
- Reading
- all checks consistent
- File
- 19810816.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 2 | 25 | 55W | 88 | 58W | 1.5 | |
| 2 | AXX – 3 | 16 | 29E | 4 | 26E | 1.5 | |
| 3 | ? – 2 | -9 | 84W | 117 | 87W | 2 | |
| 4 | AXX – 1 | -21 | 78W | 111 | 81W | 5 | |
| 5 | BXO – 2 | -25 | 58W | 91 | 61W | 6.5 | |
| 6 | BXI – 9 | -19 | 10E | 23 | 07E | 4 | |
| 7 | FKC – 37 | -15 | 27E | 6 | 24E | 17 | |
| 8 | DKC – 9 | -7 | 51E | 342 | 48E | 3 | |
| 9 | HKX – 1 | -2 | 69E | 324 | 66E | 2.5 | |
| 10 | DKI – 4 | -17 | 72E | 321 | 69E | 10 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.