Theusner Michael
Appl Opt. 2011 Oct 1;50(28):F129-33. doi: 10.1364/AO.50.00F129.
We report what is believed to be the first photographic recording of a quaternary rainbow in nature. It appears on the Sun side of the sky with its red arc at a radius of about 45° from the Sun. The original pictures have been subjected to various forms of image processing to reveal the tertiary rainbow as well as the quaternary rainbow, which are separated by only a few degrees with their colors reversed and their red arcs adjacent to each other.
我们报道了据信是自然界中首次对四级虹的摄影记录。它出现在天空中太阳一侧，其红色弧带距太阳约45°半径处。原始图片经过了各种形式的图像处理，以揭示三级虹以及四级虹，它们仅相隔几度，颜色相反且红色弧带相邻。
