The  Kelvin–Helmholtz instability (KHI), driven by a shear of the flow  velocity, has been observed in various astrophysical environments.  Shear-flow-driven instability can play an important role in energy  transfer processes in the solar coronal plasma. Dr. Li Feng and her  collaborators for the first time present the observation of a kink-like  oscillation of a streamer that is probably caused by the streaming 

kink-mode  Kelvin–Helmholtz instability (KHI). The wave-like behavior of the  streamer was observed by the Large Angle and Spectrometric Coronagraph  Experiment C2 and C3 on board the SOlar and Heliospheric Observatory.  The free energy driving the instability is supplied by the sheared flow  and sheared magnetic field across the streamer plane. The authors also  estimated the plasma properties of the local environment of the streamer  from the phase speed and instability threshold criteria. 

  This work was published on Astrophysical Journal on September 10 2013 (774, 141), and was supported by MSTC Program 2011CB811402, NSFC under grants 11003047, 11233008, 11273065 and German DLR contract 50 OC 1301.  

By with FENG li

Some  selections of the traced streamer in oscillation by LASCO C2 and C3  coronagraph images. The yellow asterisks mark the crests and trough  along the streamer.