Contrail vortices. Shear-flow instability in jet contrails causes them to show undulations which become more extreme (showing larger amplitude) with time. Usually the instability undulations (or waves) last a few minutes after the airplane has created the contrail. After that they break up and become dipole vortices or dissipate.
Location: Amersfoort, Netherlands.
Date: 12-27-04.
Photographer: Jurgen de Boer.
Amersfoort,, Contrails, de Boer, Netherlands
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