Daily Sunspot Evaluation
Observation Sheet Monday, 18 February 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)
- 51
- Relative number (R)
- 131
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19800218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HSI – 5 | 15 | 60W | 85 | 59W | 4.5 | |
| 2 | HKI – 17 | 9 | 26W | 51 | 25W | 8.5 | |
| 3 | AXX – 2 | 24 | 16W | 41 | 15W | 1 | |
| 4 | AXX – 3 | -18 | 14W | 39 | 13W | 1 | |
| 5 | DSO – 11 | -18 | 01W | 26 | 00 | 3.5 | |
| 6 | AXX – 4 | -18 | 05E | 20 | 06E | 1 | |
| 7 | CSI – 2 | -24 | 35E | 350 | 36E | 1 | |
| 8 | HKO – 7 | -9 | 58E | 327 | 59E | 4 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.