Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 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)
- 7
- Number of spots (f)
- 44
- Relative number (R)
- 114
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810121.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSI – 8 | 5 | 34W | 281 | 37W | 7 | |
| 2 | CBI – 11 | 15 | 09E | 238 | 06E | 4.5 | |
| 3 | CAI – 6 | 10 | 55E | 192 | 52E | 6.5 | |
| 4 | HAI – 14 | -22 | 01W | 248 | 04W | 4 | |
| 5 | HAX – 2 | -3 | 60E | 187 | 57E | 2 | |
| 6 | HSX – 1 | -4 | 61E | 186 | 58E | 1 | |
| 7 | I – 2 | -26 | 74E | 173 | 71E | 13 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.