Daily Sunspot Evaluation
Observation Sheet Wednesday, 15 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)
- 10
- Number of spots (f)
- 108
- Relative number (R)
- 208
- Observer
- SM
- Reading
- all checks consistent
- File
- 19810715.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARX – 1 | 23 | 74W | 170 | 76W | ||
| 2 | ARX – 3 | 21 | 23W | 119 | 25W | 1 | |
| 3 | CKI – 23 | 22 | 14W | 110 | 16W | 105 | |
| 4 | CAI – 7 | 15 | 49E | 47 | 47E | 7 | |
| 5 | AXX – 1 | 15 | 78E | 18 | 76E | ||
| 6 | AXX – 3 | -3 | 55W | 151 | 57W | 3 | |
| 7 | HKC – 18 | -28 | 05W | 101 | 08W | 35 | |
| 8 | EKI – 38 | -8 | 04W | 100 | 06W | 15 | |
| 9 | DKI – 12 | -10 | 48E | 48 | 46E | 6 | |
| 10 | AXX – 2 | -19 | 60E | 36 | 58E | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.