Daily Sunspot Evaluation
Observation Sheet Saturday, 18 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)
- 14
- Number of spots (f)
- 114
- Relative number (R)
- 254
- Observer
- SM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 1 | 21 | 63W | 120 | 66W | ||
| 2 | DAO – 8 | 24 | 53W | 110 | 56W | 9 | |
| 3 | CAI – 6 | 6 | 16W | 43 ⚠ | 19W | 5 | |
| 4 | AXX – 3 | 4 | 03W | 60 | 06W | ||
| 5 | BXI – 6 | 16 | 09E | 48 | 06E | 8 | |
| 6 | AXX – 1 | 10 | 24E | 30 | 24E | ||
| 7 | HAX – 2 | 10 | 50E | 7 | 47E | 2.5 | |
| 8 | AXX – 2 | 16 | 51E | 6 | 48E | ||
| 9 | FKC – 53 | -9 | 46W | 103 | 49W | 25 | |
| 10 | HKC – 15 | -28 | 43W | 100 | 46W | 7 | |
| 11 | AXX – 1 | -12 | 03W | 60 | 06W | ||
| 12 | CAI – 8 | -11 | 10E | 47 | 07E | 8 | |
| 13 | AXX – 2 | -19 | 21E | 36 | 18E | ||
| 14 | ? – 6 | -4 | 80E | 337 | 74E | 4 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.