Identification of standing fronts in steady state fluid flows: exact and approximate solutions for propagating MHD modes

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• 作者：Filippo Pantellini ; Léa Griton
• 关键词：Magnetohydrodynamics (MHD) ; Waves ; Planets and satellites ; magnetic fields ; Methods ; analytical
• 刊名：Astrophysics and Space Science
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：361
• 期：10
• 全文大小：3,080 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  
• 出版者：Springer Netherlands
• ISSN：1572-946X
• 卷排序：361

文摘

The spatial structure of a steady state plasma flow is shaped by the standing modes with local phase velocity exactly opposite to the flow velocity. The general procedure of finding the wave vectors of all possible standing MHD modes in any given point of a stationary flow requires numerically solving an algebraic equation. We present the graphical procedure (already mentioned by some authors in the 1960’s) along with the exact solution for the Alfvén mode and approximate analytic solutions for both fast and slow modes. The technique can be used to identify MHD modes in space and laboratory plasmas as well as in numerical simulations.