• Effect of random density irregularities on nonlinear evolution of Langmuir waves in interplanetary medium

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      https://www.ias.ac.in/article/fulltext/pram/027/01-02/0219-0231

    • Keywords

       

      Langmuir waves; interplanetary medium; sun; radio emission; random density irregularities; modified Zakharov equations

    • Abstract

       

      The evolution of nonlinear Langmuir waves in the interplanetary medium is investigated by appropriately accounting for the random density irregularities of the medium. A pair of modified Zakharov equations, which describe these waves, is solved numerically as an initial value problem for large scale (≫ 102 km) initial pertubations. For an ion acoustic-Langmuir solitary wave, the random irregularities damp the Langmuir wave by way of scattering and let the ion density perturbation radiate away in a few days. However an initial solitary or shock-like Langmuir wave excites the ion density perturbations within a fraction of a second, and then itself gets damped. These effects will strongly decelerate the collapse of large scale Langmuir waves. The possibility of detecting these processes, by means of interplanetary scintillation, is discussed.

    • Author Affiliations

       

      B Buti1 M Mohan1 2 S K Alurkar1

      1. Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, India
      2. Space Applications Centre, Ahmedabad - 380 053, India
    • Dates

       
  • Pramana – Journal of Physics | News

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