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Transition radiation in media with random inhomogeneities

机译：具有随机非均匀性的介质中的过渡辐射

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This review analyzes radiation produced by randomly inhomogeneous media excited by fast particles-i.e., polarization bremsstrahlung for thermldynamically 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.
机译：这篇综述分析了由快速粒子激发的随机不均匀介质产生的辐射-即对于热力学平衡不均匀性而言的极化ms致辐射或对于非热性质的过渡辐射-考虑了对自然源重要的所有影响。考虑了磁场对快速粒子运动和背景等离子体扩散的影响，并检查了快速粒子在介质中的多重散射。对于特定的本征模，讨论了在Cherenkov（或回旋加速器）发射条件下发生的各种共振效应。计算在动量和角度上具有实际分布的快速粒子集合的跃迁辐射强度和吸收（放大）系数。通过将其应用于天体物体，可以说明发达的跃迁辐射理论的价值。过渡辐射被证明对太阳，行星（包括地球）以及行星际和星际介质的无线电辐射有重大贡献。讨论了过渡辐射（特别是受激辐射）可能的进一步应用。

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