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Excitation of Electromagnetic Waves by an Electron Ring Beam in a Magnetized Plasma Waveguide 下载免费PDF全文
We study the resonant interactions between an electron ring beam and plasma waveguide modes,This is motivated by the research of radio emission in low solar corona.We consider a density-depleted duct(above an active region near a flare site)that may be treated as a magnetized plasma waveguide.The electromagnetic waves excited in the wveguide are classified into the so-called E-type and B-type waves.The results show that there are two unstable modes of B-type waves propagating parallel and anti-parallel to the direction of the electron beam.The effect of the finite radius and boundary conditions of the waveguide on the excitation of the electron beam.The effect of the finite radius and oundary conditions of the waveguide on the excitation of waveguide modes is important.For a given B-type mode,the smaller the radius R,the larger the temporal and spatial amplification important.For a given B-type mode.the smaller the radius R ,the larger the temporal and spatial amplification rate,we suggest that these excited waveguide modes could be one of the processes respondsible for the observed solar radio emission. 相似文献
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用数值方法研究了电子速度分布为双麦克斯韦分布的极高β等离子体的动力学不稳定性,考虑了离子热效应、离子漂移运动、少量超热电子及其漂移运动对不稳定性的影响。 相似文献
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本文指出在动量和速度空间的具有相对论性效应的共振条件的下同之处,并证明了这种差异是由在相对论性的情况下动量与速度之间的非线性关系造成的。进一步,我们讨论了如何简单地判别在何种情况下最大增长率可以存在。证明了对于的波(例如,O模和X模),无论是在动量空间还是在速度空间Wu-Lee判据给出的结论都是一样的。 相似文献
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本文考察了由于温度各向异性分布产生的电磁波不稳定性所联系的反常电阻率问题,讨论了这一现象与地球磁场磁尾区中“磁再联”现象的关系。 相似文献
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