Plasma flow hypothesis in the magnetosphere relating to frequency shift of electrostatic plasma waves
Plasma flow hypothesis in the magnetosphere relating to frequency shift of electrostatic plasma waves
复制标题
磁层中与静电等离子体波频移相关的等离子体流假说
DOI：
10.1029/ja080i019p02783
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发表时间：
1975
影响因子：
--
通讯作者：
H. Oya
中科院分区：
文献类型：
--
作者：
H. Oya
Ogo 5的VLF电场观测资料中，在等离子体层顶外的午夜子午线和黎明子午线观测到了表明静电电子回旋谐波发射单调频移的频率动态谱;发射是从等离子体状态中的湍流区域产生的，包括温度各向异性，损失锥速度分布，或速度分布函数中的双峰。对于磁鞘中太阳下点附近的发射，也观察到了频移。这些频移解释的等离子体波的多普勒效应，由于相对于卫星帧的等离子体流的假设。等离子体流的速度获得，并有一个范围从150至300公里/秒。等离子体流由于磁场凸起的中断可能产生湍流源，该湍流源产生哈里斯型或束型不稳定性，该不稳定性产生静电电子回旋谐波。
The frequency dynamic spectrum indicating a monotonic frequency shift of the electrostatic electron cyclotron harmonic wave emissions in the data of VLF electric field observations by Ogo 5 has been detected in the midnight and dawn meridians outside the plasmapause; the emissions are produced from turbulent areas in the plasma states that include the temperature anisotropy, loss cone velocity distribution, or the double hump in the velocity distribution function. The frequency shift is also observed for the case of the emissions in the magnetosheath near the subsolar point. These frequency shifts are interpreted on a hypothesis of the Doppler effects of the plasma waves due to the plasma flow with respect to the satellite frame. The speeds of the plasma flow are obtained and have a range from 150 to 300 km/s. Disruption of the plasma flow due to the magnetic field bumps may produce the turbulent source generating the Harris type or beam type instabilities that generate the electrostatic electron cyclotron harmonic waves.