Scattering of Electromagnetic Waves by Drift Vortex in Plasma

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In a quasi-two-dimensional model,the scattering of incident ordinary electromag-netic waves by a dipole-electrostatic drift vortex is studied with first-order Born approximation.The distribution of the scattering cross-section and total cross-section are evaluated analyticallyin different approximate conditions,and the physical interpretations are discussed.When thewavelength of incident wave is much longer than the vortex radius (k_ia<<1),it is found that theangle at which the scattering cross-section reaches its maxim depends significantly on the approxi-mation of the parameters of the vortex used.It is also found that the total scattering cross-sectionhas an affinitive relation with the parameters of the plasma,while it is irrelevant to the frequencyof the incident wave in a wide range of parameters of the vortex.In a totally different range ofparameters when incident wave is in the radar-frequency range (then k_ia<<1,the wavelengthof incident wave is much shorter than the vortex radius),the numerical procedure is conductedwith computer in order to obtain the distribution and the total expression of the scattering cross-section.Then it is found that the total scattering cross-section in the low frequency range is muchlarger than that in high frequency range,so the scattering is more effective in the low frequencyrange than in high frequency range. In a quasi-two-dimensional model, the scattering of incident ordinary electromag-netic waves by a dipole-electrostatic drift vortex is studied with first-order Born approximation. The distribution of the scattering cross-section and total cross-section are evaluated analyticallyin different approximate conditions, and the physical interpretations are discussed. Having the wave length of incident wave is much longer than the vortex radius (k_ia << 1), it is found that the angle at which the scattering cross-section reaches its maxim depends significantly on the approxi -mation of the parameters of the vortex used.It is also found that the total scattering cross-sectionhas an affinitive relation with the parameters of the plasma, while it is irrelevant to the frequencyof the incident wave in a wide range of parameters of the vortex .In a totally different range of parameters when incident wave is in the radar-frequency range (then k_ia << 1, the wavelength of incident wave is much shorter than the vortex ra dius), the numerical procedure is conducted with computer in order to obtain the distribution and the total expression of the scattering cross-section. It is found that the total scattering cross-section in the low frequency range is muchlarger than that in high frequency range , so the scattering is more effective in the low frequencyrange than in high frequency range.
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