Daily Sunspot Evaluation
Observation Sheet Thursday, 18 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)
- 8
- Number of spots (f)
- 60
- Relative number (R)
- 140
- Observer
- ED
- Reading
- all checks consistent
- File
- 19800918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAI – 6 | 15 | 53W | 148 | 54W | 4 | |
| 2 | BXO – 5 | 22 | 25W | 120 | 28W | 2.5 | |
| 3 | BXO – 2 | 19 | 52E | 43 | 49E | 4.5 | |
| 4 | BXI – 4 | -8 | 55W | 150 | 58W | 4.5 | |
| 5 | DAI – 14 | -11 | 25W | 120 | 28W | 6 | |
| 6 | DAI – 13 | -12 | 13W | 108 | 16W | 5 | |
| 7 | BXI – 13 | -10 | 20E | 75 | 17E | 5 | |
| 8 | HAX – 3 | -30 | 42E | 53 | 39E | 1.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.