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A Model for Periodic Nonlinear Electric Field Structures in Space Plasmas
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作者 M.N.S. Qureshi SHI Jian-Kui LIU Zhen-Xing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第7期149-154,共6页
In this study,we present a physical model to explain the generation mechanism of nonlinear periodic waveswith a large amplitude electric field structures propagating obliquely and exactly parallel to the magnetic fiel... In this study,we present a physical model to explain the generation mechanism of nonlinear periodic waveswith a large amplitude electric field structures propagating obliquely and exactly parallel to the magnetic field.The'Sagdeev potential' from the MHD equations is derived and the nonlinear electric field waveforms are obtained when theMach number,direction of propagation,and the initial electric field satisfy certain plasma conditions.For the parallelpropagation,the amplitude of the electric field waves with ion-acoustic mode increases with the increase of initial electricfield and Mach number but its frequency decreases with the increase of Mach number.The amplitude and frequency ofthe electric field waves with ion-cyclotron mode decrease with the increase of Mach number and become less spiky,andits amplitude increases with the increase of initial electric field.For the oblique propagation,only periodic electric fieldwave with an ion-cyclotron mode obtained,its amplitude and frequency increase with the increase of Mach number andbecome spiky.From our model the electric field structures show periodic,spiky,and saw-tooth behaviours correspondingto different plasma conditions. 展开更多
关键词 nonlinear waves electric field solitary structures
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厦门:盼望能有合理价位
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作者 柳占 《家用电器》 2003年第10期28-28,共1页
关键词 厦门市 高端彩电市场 离子等电视 背投电视 液晶彩电
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