Daily Sunspot Evaluation
Observation Sheet Friday, 4 September 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)
- 14
- Number of spots (f)
- 106
- Relative number (R)
- 246
- Observer
- GT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810904.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 3 | 15 | 65W | 208 | 68W | 8.5 | |
| 2 | AXX – 1 | 20 | 55W | 197 | 59W | - | |
| 3 | HSX – 1 | 15 | 23W | 166 | 26W | 1 | |
| 4 | HAX – 3 | 7 | 06E | 137 | 03E | 2 | |
| 5 | AXX – 1 | 5 | 13E | 130 | 10E | - | |
| 6 | CSI – 10 | 12 | 15E | 127 | 12E | 8.5 | |
| 7 | ? – 4 | 9 | 82E | 61 | 79E | 6 | |
| 8 | AXX – 1 | -9 | 56W | 189 ⚠ | 59W | - | |
| 9 | EKI – 30 | -13 | 37W | 170 ⚠ | 40W | 14 | |
| 10 | HSX – 1 | -25 | 09W | 150 | 10W | 1 | |
| 11 | DKI – 25 | -10 | 09E | 134 | 06E | 10 | |
| 12 | BXI – 10 | -6 | 15E | 127 | 12E | 5 | |
| 13 | HHX – 11 | -17 | 21E | 122 | 18E | 5 | |
| 14 | BXI – 5 | -19 | 29E | 114 | 26E | 4 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.