Daily Sunspot Evaluation
Observation Sheet Friday, 17 June 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)
- 6
- Number of spots (f)
- 39
- Relative number (R)
- 99
- Observer
- HG
- Reading
- all checks consistent
- File
- 19830617.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | DAO – 7 | 17 | 156 | |
| 2 | CAI – 11 | 13 | 158 | |
| 3 | AXX – 1 | -10 | 154 | |
| 4 | HAX – 1 | -27 | 155 | |
| 5 | BXI – 9 | -8 | 157 | |
| 6 | DAC – 10 | -13 | 162 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.