SkyStef's weather & aviation page
Picture of the month June 2011
|Picture taken at Kampenhoutl on May 6 2011 at 1913 hr.|
When ice crystals are present in the atmosphere halo's can appear in different forms like arcs, rings or bright spots. Under "perfect" conditions, even a complex halo display can show up. Besides the common ones (like parhelia/sun dogs and 22° halo), also the more rare ones can be visible. On May 6 2011, such complex display could be witnessed for over than half an hour with no less than 7 different halo's at the same time. The common halo's were: two bright spots or parhelia (1) in the parhelic circle (2), the 22° halo (3) with on the top upper tangent arc (4) and finally also the circumzenithal arc. The two rare ones were: Parry arc (as rather faint suncave feature on top of the upper tanget arc) and a huge & bright colorful supralateral arc (with touching circumzenthal arc). The supralateral arc is often mistaken for a 46° halo, but one of the indicators for being a supralateral arc is when 22° halo is rather faint and upper tangent arc very bright, and such was the case in this shot.
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