Daily Sunspot Evaluation
Observation Sheet Thursday, 31 July 1980
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)
- 7
- Number of spots (f)
- 22
- Relative number (R)
- 92
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19800731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSI – 5 | 19 | 44E | 339 | 41E | 7 | |
| 2 | CAO – 6 | 19 | 05W | 28 | 08W | 5.5 | |
| 3 | HSX – 3 | 28 | 01W | 25 | 05W | 4 | |
| 4 | AXX – 1 | -30 | 47E | 336 | 44E | - | |
| 5 | HSX – 3 | -7 | 22W | 45 | 25W | 3.5 | |
| 6 | ARA – 2 | -8 | 13W | 36 | 16W | - | |
| 7 | AXX – 2 | -35 | 19E | 4 | 16E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.