Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 September 1980
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)
- 40
- Relative number (R)
- 110
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19800917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DHO – 4 | 15 | 40W | 149 | 43W | 4 | |
| 2 | CAI – 7 | 39 | 30W | 139 | 33W | 8.25 | |
| 3 | AXX – 1 | -9 | 45W | 154 | 48W | ||
| 4 | DAI – 9 | -11 | 11W | 120 | 14W | 4.5 | |
| 5 | DAI – 14 | -12 | 02W | 111 | 05W | 8 | |
| 6 | CAO – 3 | -10 | 34E | 75 | 31E | 4 | |
| 7 | HAX – 2 | -31 | 54E | 55 | 51E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.