aurora borealis over the fjord

The first thing that I said when I saw the picture was " WoooW".  I was amazed by the picture. How did he catch the reflection of the lights in that beautiful way? and I was wondering about the time? Is it the first hours of the sunrise or sunset?

@rehab aloyni : it was in the middle of the night. and it was cold, the water was beginning to freeze.  the tidal current in the fjord has come to rest for that moment. kind regards, anne 

Great tones and effect, well captured.