Electromechanical Effect in Complex Plasmas
  Experimental results on an auto-oscillatory pattern observed in a complex plasma are presented. The experiments are performed with an argon plasma which is produced under microgravity conditions using a capacitively-coupled rf discharge at low power and gas pressure. The observed intense wave activity in the complex plasma cloud correlates well with the low-frequency modulation of the discharge voltage and current and is initiated by periodic void contractions. Particle migrations forced by the waves are of long-range repulsive and attractive character. 
S. Zhdanov (1), M. Schwabe (1), R Heidemann (1), H.M. Thomas (1), M.   Rubin-Zuzic (1), H. Rothermel (1), T. Hagl (1), A.V. ...