Daily Sunspot Evaluation
Observation Sheet Saturday, 31 January 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)
- 8
- Number of spots (f)
- 60
- Relative number (R)
- 140
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810131.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKO – 12 | 16 | 21E | 92 | 21E | 55 | |
| 2 | CAI – 4 | 14 | 42E | 71 | 42E | 7 | |
| 3 | HKX – 5 | 19 | 51E | 62 | 51E | 5 | |
| 4 | AXX – 2 | 15 | 60E | 53 | 60E | 1 | |
| 5 | DAO – 13 | -12 | 09E | 104 | 09E | 8 | |
| 6 | CAI – 11 | -16 | 25E | 88 | 25E | 8 | |
| 7 | EKI – 10 | -11 | 31E | 82 | 31E | 12 | |
| 8 | CAO – 3 | -7 | 55E | 58 | 55E | 5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.