Daily Sunspot Evaluation
Observation Sheet Wednesday, 19 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)
- 13
- Number of spots (f)
- 133
- Relative number (R)
- 263
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810819.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 14 | 11 | 51W | 45 | 54W | 6.5 | |
| 2 | AXX – 1 | 16 | 21W | 15 | 24W | - | |
| 3 | BXO – 4 | -13 | 62W | 56 | 65W | 4.5 | |
| 4 | FKC – 38 | -15 | 14W | 8 | 17W | 1.9 | |
| 5 | AXX – 5 | -9 | 11W | 5 | 14W | - | |
| 6 | DAI – 26 | -6 | 12E | 342 | 09E | 4.5 | |
| 7 | AXX – 2 | -11 | 14E | 340 | 11E | 2.5 | |
| 8 | DSO – 7 | -6 | 25E | 829 ⚠ | 22E | 7 | |
| 9 | HKX – 1 | -2 | 29E | 325 | 26E | 2.5 | |
| 10 | DKO – 13 | -15 | 31E | 323 | 28E | 1.3 | |
| 11 | CSI – 10 | -7 | 35E | 319 | 32E | 7 | |
| 12 | DAC – 8 | -7 | 61E | 293 | 58E | 6 | |
| 13 | CAI – 4 | -11 | 74E | 280 | 71E | 0 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.