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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Whistler wave excitation by a loop antenna in a bounded collisional magnetoplasma
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Whistler wave excitation by a loop antenna in a bounded collisional magnetoplasma

机译：有限碰撞磁等离子体中环形天线的惠斯勒波激发

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摘要

Excitation of electromagnetic waves by spatially bounded given electric currents in the presence of an axially magnetized cylindrical plasma column surrounded by free space is studied. A rigorous solution for the total field comprising both the discrete and continuous parts of the spatial spectrum of the excited waves is found. Using the obtained field representation, an expression for the impedance of a loop antenna is derived and the contributions of guided and unguided modes of the column to the antenna impedance are determined for the whistler frequency range. Conditions have been revealed under which the real part of the antenna impedance is dominated by the contribution of guided waves. It is shown that when allowance for relatively small collisional losses in the plasma results in division of the guided whistler waves into weakly and strongly damped modes with significantly different field structures, appreciable redistribution of the antenna-launched power among the excited modes takes place. The results obtained are useful for clarification of the power-absorption mechanisms of whistler-range waves in a cylindrical magnetoplasma.
机译：研究了在被自由空间包围的轴向磁化的圆柱等离子体柱的存在下，空间给定电流对电磁波的激励。对于包含激发波空间频谱的离散和连续部分的整个场，找到了严格的解决方案。使用获得的场表示，可以得出环形天线阻抗的表达式，并确定惠斯勒频率范围内导柱和非导柱模式对天线阻抗的贡献。已经揭示出条件，在这些条件下，天线阻抗的实部由导波的贡献所支配。结果表明，当等离子体中相对较小的碰撞损耗允许将引导的惠斯勒波分成场结构明显不同的弱阻尼模式和强阻尼模式时，就会在激励模式之间发生天线发射功率的明显重新分配。获得的结果对于阐明圆柱形磁等离子体中的惠斯范围波的功率吸收机理是有用的。

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