Daily Sunspot Evaluation
Observation Sheet Thursday, 15 February 1990
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
- YK
- Reading
- all checks consistent
- File
- 19900215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 17 | 12 | 46W | 138 | 47W | 8 | 66 |
| 2 | AX – 2 | 32 | 17W | 109 | 18W | - | 69 |
| 3 | HS – 10 | 20 | 16W | 108 | 17W | 5.5 | 68 |
| 4 | AX – 1 | 15 | 61E | 31 | 60E | 0.5 | 73 |
| 5 | AX – 2 | -21 | 14W | 106 | 15W | 0.5 | 74 |
| 6 | AX – 7 | -14 | 01E | 91 | 00 | 1.5 | 71 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.