Daily Sunspot Evaluation
Observation Sheet Thursday, 15 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)
- 5
- Number of spots (f)
- 36
- Relative number (R)
- 86
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810115.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 12 | 4 | 20W | 345 | 22W | 5.5 | |
| 2 | ARX – 3 | 13 | 06W | 331 | 08W | 1.5 | |
| 3 | DAI – 12 | 4 | 47E | 278 | 45E | 5.5 | |
| 4 | CAO – 6 | -19 | 11W | 336 | 13W | 7.25 | |
| 5 | HKX – 3 | -21 | 76E | 249 | 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.