Upconversion of whistler waves by gyrating ion beams in a plasma |
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Authors: | Harsha Jalori Sunil K Singh A K Gwal |
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Institution: | (1) Space Science Laboratory, Department of Physics and Electronics, Barkatullah University, 462 026 Bhopal, India |
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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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Keywords: | Electromagnetic waves magnetic field whistler |
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