This page from the NASA Langley Research Center contains an image and description of a wake vortex created by the wing of a small propeller plane. The page explains how the image was made and how this research helps determine the spacing between airplanes approaching an airport.
NASA Langley Research Center. Wake Vortex Study at Wallops Island. Hampton: NASA Langley Research Center, March 10, 2003. http://lisar.larc.nasa.gov/UTILS/info.cgi?id=EL-1996-00130 (accessed 1 March 2015).
%0 Electronic Source %D March 10, 2003 %T Wake Vortex Study at Wallops Island %I NASA Langley Research Center %V 2015 %N 1 March 2015 %8 March 10, 2003 %9 image/jpeg %U http://lisar.larc.nasa.gov/UTILS/info.cgi?id=EL-1996-00130
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