Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 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)
- 5
- Number of spots (f)
- 39
- Relative number (R)
- 89
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810318.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DSI – 13 | 14 | 34W | 264 | 27W | 6.5 | |
| 2 | DAI – 12 | 9 | 23E | 207 | 20E | 5 | |
| 3 | DAO – 5 | 18 | 55E | 175 | 52E | 9 | |
| 4 | CAO – 4 | 11 | 65E | 165 | 62E | 3.5 | |
| 5 | BXI – 5 | -5 | 43W | 273 | 46W | 7 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.