Daily Sunspot Evaluation
Observation Sheet Thursday, 18 August 1983
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)
- 23
- Relative number (R)
- 93
- Observer
- TS
- Reading
- all checks consistent
- File
- 19830818.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 1 | 65W | 158 | 89W | 2 | 243 |
| 2 | BRI – 5 | 8 | 16W | 109 | 20W | 3 | 246 |
| 3 | CAO – 3 | 20 | 08E | 85 | 04E | 4 | 249 |
| 4 | ARX – 2 | 6 | 08E | 85 | 04E | 2.25 | 254 |
| 5 | ? – 2 | 11 | 77E | 16 | 73E | 2 | 255 |
| 6 | EAI – 8 | -5 | 66W | 159 | 70W | 18 | 244 |
| 7 | AXI – 2 | -20 | 14W | 107 | 18W | 0.75 | 248 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.