On April 5th 2007 there was typical nice, but, dry“ cirrostratus in the sky without presence of halos. I was continuously checking the sky and after 10:00 I noticed very faint halo that had unusually wide upper part. That was very suspicious to me so I started to take photos which were after processed by Registax. You can see the result in the output picture. There are two separated halos which I later identified through the comparison with night sky, as 20° and 23° halos. Maybe there is also 35° halo, but it cant be certainly identified from the picture. The phenomenon could originate at 0,3-0,0-0,0 or 1,0-0,0-0,0 crystals.
I saw very similar displays with nice, "dry" cirrostratus and then with faint odd radius halos on June 22nd 2006 and August 26th 2006 so that is quite interesting.
Martin Popek
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