Sunday, 1 November 2020

One more case of sub-Kern companion arcs

Sometimes a sub-Kern arc "bleeds": it is accompanied by thin arcs below the brightest parts. The first case we photographed on the night of 6/7 January 2016 and second on 28/29 November 2016, both in Rovaniemi. Here is a third display with these arcs in Rovaniemi, photographed on the night of 4/5 January 2017. The lamp is somewhere between 5 and 10 degrees below the horizon. The temperature at this roadside field was -38 C, the lowest I experienced that winter. Earlier that night, at another location, I had photographed odd radius sub-plate arcs.


Below are three more photos from that location, taken before the the sub-Kern company arcs appeared.


  1. Your super diamond dust halo pics never get old keep them coming buddy!

  2. I am moving to Rovaniemi in a few days. However, I don't have a car, so I am not looking to chase much this winter. But some folks may be coming for a visit, so let's hope we can bag at least some of those Rovaniemi diamond dusts.

    1. Get you one or get a dirt bike and make it street legal