The Halo Vault

Hello everyone, after several talks with Alec, I decided to make some digging into my old odd radius halos displays to search for rare halos...

Often, when I see the clouds coming from west , I try to do a high cloud sunset to see if there is something to see (like sun pillar and sun...

Sunshine has been a rare phenomenon in Finland this winter. On 16th January, the sky was finally clear and temperature had dropped to -25°C,...

11-frame stack at sun elevation 2°: unsharp mask and colour enhancement (top), and background subtraction + blue-minus-red colour subtrac...

Two rounds of week-long odd-radii outbreaks swept across southern China in July and August. The second outbreak turned out to be the more no...

Upper left and upper right are image processing by N. Lefaudeux. Lower left is my own processing, and lower right the simulation. All ver...

When I first noticed the display at 08-10 local time on 31 May 2018, it was already well-developed. The high cloud layer was very thin and ...