Daily Sunspot Evaluation
Observation Sheet Thursday, 31 January 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)
- 10
- Number of spots (f)
- 81
- Relative number (R)
- 181
- Observer
- AÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19800131.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HSX – 1 | 14 | 28W | 294 | 31W | 1 | |
| 2 | HSX – 1 | 15 | 12E | 254 | 15E | 2 | |
| 3 | HSX – 16 | 5 | 13E | 253 | 16E | 6 | |
| 4 | EKI – 33 | 14 | 33E | 233 | 34E | 12 | |
| 5 | CSO – 4 | 12 | 47E | 219 | 50E | 2.5 | |
| 6 | HSX – 1 | 18 | 68E | 203 ⚠ | 66E | 2 | |
| 7 | CRO – 3 | -11 | 46W | 312 | 49W | 2 | |
| 8 | AXX – 1 | -22 | 10W | 276 | 13W | - | |
| 9 | EKI – 20 | -15 | 63E | 203 | 60E | 13 | |
| 10 | ? – 1 | -12 | 80E | 186 | 77E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.