Wave propagation and dipole radiation in a suddenly created plasma
Wave propagation and dipole radiation in a suddenly created plasma
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DOI：
10.1109/tap.1975.1141007
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发表时间：
1975
影响因子：
5.7
通讯作者：
Ching-Lin Jiang
中科院分区：
文献类型：
--
作者：
Ching-Lin Jiang
本文研究了电磁波在突然产生的等离子体中的传播和辐射。场的表达式是通过使用拉普拉斯变换得到的。源的空间分布被认为是任意的，但受到限制。详细考虑了两种情况：1）平面波在无源区的传播和2）电偶极子辐射。在平面波传播的情况下，各个方面，如波分裂，频移，相速度和群速度，振幅变化，功率流，和能量关系进行了讨论。在电偶极子辐射的情况下，电磁场和瞬时辐射功率的计算和表达的洛梅尔函数的两个变量。这些数量的渐近表达式和图形的数值计算结果。讨论了球面波和功率辐射的许多有趣的性质。
Propagation and radiation of electromagnetic waves from oscillating sources in a suddenly created plasma are studied in this investigation. Field expressions are derived through the use of Laplace transformations. The spatial distribution of sources is taken to be arbitrary but confined. Two cases are considered in detail: 1) plane wave propagation in a source-free region and 2) electric point dipole radiation. In the case of plane wave propagation, various aspects such as wave split, frequency shift, phase and group velocities, amplitude changes, power flows, and energy relations are discussed. In the case of electric dipole radiation, the electromagnetic fields and instantaneous radiated power are calculated and expressed in terms of Lommel functions of two variables. Asymptotic expressions and graphical results of numerical calculations of these quantities are presented. Many interesting properties of the spherical waves and power radiation are discussed.