Spontaneous excitations of low amplitude hole filaments, acoustic vortices, and rogue wave events in weakly disordered dust acoustic waves

Ya Yi Tsai, Mei Chu Chang, Jun Yi Tsai, I. Lin

Research output: Contribution to journalReview articlepeer-review

Abstract

In this work, we briefly review our recent experimental studies on the observations and waveform dynamics of spontaneous excitations of low and high amplitude singular objects: low amplitude hole filaments coinciding with the wiggling trajectories of topological defects surrounded by acoustic vortices with helical waveforms, and uncertain rogue wave events, in self-excited weakly disordered dust acoustic waves. The changes of waveform topology, caused by kinking, rupturing and reconnection of sequential wave crests surfaces, and the reversed process, are responsible for the chaotic creation, propagation, and annihilation of acoustic vortex pairs with opposite helicities winding around low amplitude hole filaments. The observed rogue wave events are preceded by a higher probability of surrounding defects. Particle focusing by the transverse electric forces from ruptured and tilted wave crests nearby defects are identified as the major cause for rogue wave generation.

Original languageEnglish
Article number054006
JournalPlasma Physics and Controlled Fusion
Volume59
Issue number5
DOIs
StatePublished - 24 Mar 2017

Keywords

  • acoustic vortex
  • dusty plasma
  • low amplitude filaments
  • rogue wave event
  • topological defect
  • weakly disordered dust acoustic wave

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