Daily Sunspot Evaluation
Observation Sheet Wednesday, 4 February 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)
- 11
- Number of spots (f)
- 97
- Relative number (R)
- 207
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810204.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 2 | 21 | 30W | 93 | 33W | 1 | |
| 2 | CSI – 9 | 15 | 29W | 92 | 32W | 10 | |
| 3 | HKI – 15 | 20 | 02E | 61 | 01W | 5.25 | |
| 4 | ? – 1 | 12 | 80E | 343 | 77E | 4.5 | |
| 5 | CAI – 6 | 4 | 64E | 359 | 61E | 5 | |
| 6 | EAO – 6 | -13 | 41W | 104 | 44W | 11.25 | |
| 7 | CAI – 10 | -16 | 37W | 100 | 40W | 4 | |
| 8 | BXO – 6 | -14 | 30W | 92 | 33W | 3.5 | |
| 9 | EKO – 27 | -10 | 20W | 83 | 23W | 14.5 | |
| 10 | BXI – 8 | -15 | 02W | 65 | 05W | 3 | |
| 11 | BXI – 7 | -8 | 04E | 59 | 01E | 5.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.