Generation of waves in the Venus mantle by the ion acoustic beam instability
Generation of waves in the Venus mantle by the ion acoustic beam instability
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离子声束不稳定性在金星地幔中产生波
DOI：
10.1029/93gl01984
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发表时间：
1993
影响因子：
5.2
通讯作者：
J. Huba
中科院分区：
文献类型：
--
作者：
J. Huba
离子声束的不稳定性被认为是产生在金星地幔中观察到的频率为100 Hz和730 Hz的波湍流的一种机制。等离子体被假定为由一个固定的，冷的O+离子等离子体和流动的，冲击太阳风等离子体。O+离子相对于流动的电离鞘等离子体以束的形式出现，电离鞘等离子体提供了驱动不稳定性的自由能。驱动等离子体不稳定的逆电子朗道阻尼的离子声波与冷，电离层O+离子。这种不稳定性可以直接在金星地幔中产生观测到的100 Hz波，也可以通过卫星运动引起的多普勒频移产生观测到的730 Hz波。
The ion acoustic beam instability is suggested as a mechanism to produce wave turbulence observed in the Venus mantle at frequencies 100 Hz and 730 Hz. The plasma is assumed to consist of a stationary, cold O+ ion plasma and a flowing, shocked solar wind plasma. The O+ ions appear as a beam relative to the flowing ionosheath plasma which provides the free energy to drive the instability. The plasma is driven unstable by inverse electron Landau damping of an ion acoustic wave associated with the cold, ionospheric O+ ions. The instability can directly generate the observed 100 Hz waves in the Venus mantle, as well as the observed 730 Hz waves through the Doppler shift of the frequency caused by the satellite motion.