Conversion of Electrostatic Plasma Waves into Electromagnetic Waves: Numerical Calculation of the Dispersion Relation for All Wavelengths
Conversion of Electrostatic Plasma Waves into Electromagnetic Waves: Numerical Calculation of the Dispersion Relation for All Wavelengths
复制标题
静电等离子体波转换为电磁波：所有波长色散关系的数值计算
DOI：
10.1029/rs006i012p01131
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发表时间：
1971
期刊：
影响因子：
1.6
通讯作者：
H. Oya
中科院分区：
文献类型：
--
作者：
H. Oya
已经计算出从电磁波到具有麦克斯威尔速度分布函数的磁性温暖等离子体中的多种波长。静电波和电磁波的静电波。当波长变长时，抑制频率在频率范围内从血浆频率到上层杂种共振频率在长波长区域的频率范围内。电磁X模式反射在此逃生过程中进行。速度范围l00υth<υ<l000节（对于非延迟等离子体），其中若th是电子热速度，而其起源是静电波与低能等离子体束相互作用。
The dispersion curves have been computed for a wide range of wavelengths from electromagnetic waves to electrostatic waves in a magnetoactive warm plasma with a Maxwellian velocity distribution function. The computation was carried out mainly for the perpendicular propagation mode. The upper hybrid resonance is the connection point of the electrostatic waves and the electromagnetic waves. The electrostatic waves not associated with the upper hybrid resonance are subjected to electron cyclotron damping when the wavelength becomes long. Oblique propagation is allowed for the electrostatic waves in a frequency range from the plasma frequency to the upper hybrid resonance frequency in the long-wavelength region where Landau damping can be neglected and where the electrostatic mode smoothly connects to the electromagnetic X-mode. In a slightly inhomogeneous plasma, the Bernstein-mode electrostatic wave can escape by being converted into the O-mode electromagnetic wave; two reflections take place during this escape process. The frequency range of the escape coincides with the Cerenkov radiation of the electromagnetic waves, but these two mechanisms indicate clear contrast in its origin. The electromagnetic Cerenkov radiation is produced interacting with the high-energy plasma beam with velocity range l00υth < υ < l000υth (for the nonrelativisitic plasma), where υth is the electron thermal velocity, whereas the origin of the electrostatic waves is in the interaction with the low-energy plasma beam.