Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 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)
- 11
- Number of spots (f)
- 72
- Relative number (R)
- 182
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 5 | 5 | 59W | 76 | 62W | 2 | |
| 2 | AXX – 2 | 2 | 48W | 65 | 51W | 2 | |
| 3 | DKC – 34 | 16 | 08E | 9 | 06E | 10 | |
| 4 | HAX – 3 | 10 | 10E | 7 | 07E | 25 | |
| 5 | ? – 1 | -27 | 82W | 99 | 85W | ? | |
| 6 | ? – 4 | -9 | 80W | 97 | 83W | ? | |
| 7 | AXX – 1 | -19 | 37E | 340 | 34E | - | |
| 8 | KKC – 17 | -8 | 39E | 338 | 36E | 10 | |
| 9 | AXX – 2 | -9 | 49E | 329 | 46E | 15 | |
| 10 | AXX – 2 | -21 | 57E | 320 | 54E | - | |
| 11 | ? – 1 | -11 | 81E | 296 | 78E | ? |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.