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Upconversion of whistler waves by gyrating ion beams in a plasma

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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.

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Authors and Affiliations

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

    Harsha Jalori, Sunil K. Singh & A. K. Gwal

Authors
  1. Harsha Jalori
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  2. Sunil K. Singh
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  3. A. K. Gwal
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Jalori, H., Singh, S.K. & Gwal, A.K. Upconversion of whistler waves by gyrating ion beams in a plasma. Pramana - J Phys 63, 595–610 (2004). https://doi.org/10.1007/BF02704486

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  • DOI: https://doi.org/10.1007/BF02704486

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