Daily Sunspot Evaluation
Observation Sheet Friday, 20 March 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)
- 9
- Number of spots (f)
- 72
- Relative number (R)
- 162
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810320.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 11 | 14 | 61W | 265 | 64W | 35 | |
| 2 | DSC – 22 | 9 | 04W | 208 | 07W | 55 | |
| 3 | AXX – 3 | 13 | 10E | 194 | 07E | 175 | |
| 4 | AXX – 1 | 14 | 18E | 186 | 15E | ||
| 5 | DAO – 8 | 19 | 29E | 175 | 26E | 8 | |
| 6 | DAI – 11 | 11 | 38E | 166 | 35E | 105 | |
| 7 | EKI – 11 | 15 | 61E | 143 | 58E | 13 | |
| 8 | ? – 1 | 19 | 74E | 130 | 71E | 15 | |
| 9 | CAO – 4 | -18 | 67E | 137 | 64E | 5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.