Transition radiation in media with random inhomogeneities
Transition radiation in media with random inhomogeneities
复制标题
具有随机不均匀性的介质中的跃迁辐射
DOI：
10.1070/pu2002v045n03abeh000952
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发表时间：
2002
期刊：
影响因子：
2.7
通讯作者：
G. Fleishman
中科院分区：
文献类型：
--
作者：
K. Platonov;G. Fleishman
这篇综述分析了由快速粒子激发的随机非均匀介质产生的辐射，极化韧致辐射用于热平衡不均匀性，或过渡辐射用于非热不均匀性--考虑了所有对自然源重要的影响。考虑了磁场对快粒子运动和背景等离子体色散的影响，研究了快粒子在介质中的多次散射。讨论了在切伦科夫（或回旋）辐射条件下，对某一特定本征模所产生的各种共振效应。过渡辐射强度和吸收（放大）系数计算的合奏的快粒子与现实的分布在动量和角度。通过将发展的跃迁辐射理论应用于天体物理学物体，说明了它的价值。过渡辐射被证明对太阳、行星（包括地球）、行星际和星际介质的无线电发射有重要贡献。过渡辐射（特别是受激）可能的进一步应用进行了讨论。
This review analyzes radiation produced by randomly inhomogeneous media excited by fast particles — i.e., polarization bremsstrahlung for thermodynamically equilibrium inhomogeneities or transition radiation for nonthermal ones — taking into account all the effects important for natural sources. Magnetic field effects on both the motion of fast particles and the dispersion of background plasma are considered, and the multiple scattering of fast particles in the medium is examined. Various resonant effects occurring under the conditions of Cherenkov (or cyclotron) emission for a particular eigenmode are discussed. The transition radiation intensity and absorption (amplification) coefficients are calculated for ensembles of fast particles with realistic distributions over momentum and angles. The value of the developed theory of transition radiation is illustrated by applying it to astrophysical objects. Transition radiation is shown to contribute significantly to the radio emission of the Sun, planets (including Earth), and interplanetary and interstellar media. Possible further applications of transition radiation (particularly stimulated) are discussed.