Halodisplay at Espoo (18th May 2007)
This composite image is made with Registax v4, totally 41 frames are stacked and finally unsharpmasked. Visually 22 ring and circumscribed halo were present most of the time. Image processing reveals that there is a faint parhelic circle present, on the right side of the sun. There is also a small trace of a 46 ring halo on the right side of the sun, mostly visible between directions of 2 and 4 o'clock. Appearance of these two last halo types was confirmed.
circumscribed halo22 ring46 ringparhelic circlesunhalostackingusmfinlandespookarakallio