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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/063/03/0595-0610

    • Keywords

       

      Electromagnetic waves; magnetic field; whistler

    • Abstract

       

      A gyrating ion beam, with a ring-shaped distribution in velocity, supports negative energy beam modes near the harmonics of beam gyro-frequency. An investigation of the non-linear interaction of high-frequency whistler waves with the negative energy beam cyclotron mode is made. A non-linear dispersion relation is derived for the coupled modes. It is shown that a gyrating ion-beam frequency upconverts the whistler waves separated by harmonics of beam gyro-frequency. The expression for the growth rate of whistler mode waves has been derived. In Case 1, a high-amplitude whistler wave decays into two lower frequency waves, called a low-frequency mode and a side band of frequency lower than that of pump wave. In Case 2 a high-amplitude whistler wave decays into two lower frequency daughter waves, called the low-frequency mode and whistler waves. Generation mechanism of these waves has application in space and laboratory plasmas.

    • Author Affiliations

       

      Harsha Jalori1 Sunil K Singh1 A K Gwal1

      1. Space Science Laboratory, Department of Physics and Electronics, Barkatullah University, Bhopal - 462 026, India
    • Dates

       
  • Pramana – Journal of Physics | News

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