{"title":"无碰撞静电速度-剪切驱动不稳定性的模拟","authors":"P. Pritchett","doi":"10.1063/1.860847","DOIUrl":null,"url":null,"abstract":"The properties of electrostatic instabilities in velocity shear layers in collisionless plasmas are investigated by means of two‐dimensional particle simulations for the case where the ion gyroradius is comparable to the scale length of the velocity shear. For modes exactly perpendicular to the magnetic field, the Kelvin–Helmholtz instability dominates the evolution of the system producing eφ/Te≳1; the observed growth rates show no reduction compared to the hydromagnetic limit. To obtain this result for the case of negative shear (v0y’/Ωi<0), it is necessary to include the kinetic modifications to the structure of the shear layer equilibrium. For finite k∥ in the range 0<k∥/k<0.04, the shorter‐wavelength inhomogeneous‐energy‐density‐driven instability cannot be identified in the simulations, and the upper limit on its excitation is eφ/Te≲2×10−3.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"178 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1993-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"19","resultStr":"{\"title\":\"Simulation of collisionless electrostatic velocity‐shear‐driven instabilities\",\"authors\":\"P. Pritchett\",\"doi\":\"10.1063/1.860847\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The properties of electrostatic instabilities in velocity shear layers in collisionless plasmas are investigated by means of two‐dimensional particle simulations for the case where the ion gyroradius is comparable to the scale length of the velocity shear. For modes exactly perpendicular to the magnetic field, the Kelvin–Helmholtz instability dominates the evolution of the system producing eφ/Te≳1; the observed growth rates show no reduction compared to the hydromagnetic limit. To obtain this result for the case of negative shear (v0y’/Ωi<0), it is necessary to include the kinetic modifications to the structure of the shear layer equilibrium. For finite k∥ in the range 0<k∥/k<0.04, the shorter‐wavelength inhomogeneous‐energy‐density‐driven instability cannot be identified in the simulations, and the upper limit on its excitation is eφ/Te≲2×10−3.\",\"PeriodicalId\":113346,\"journal\":{\"name\":\"Physics of fluids. B, Plasma physics\",\"volume\":\"178 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1993-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"19\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics of fluids. B, Plasma physics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1063/1.860847\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of fluids. B, Plasma physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1063/1.860847","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Simulation of collisionless electrostatic velocity‐shear‐driven instabilities
The properties of electrostatic instabilities in velocity shear layers in collisionless plasmas are investigated by means of two‐dimensional particle simulations for the case where the ion gyroradius is comparable to the scale length of the velocity shear. For modes exactly perpendicular to the magnetic field, the Kelvin–Helmholtz instability dominates the evolution of the system producing eφ/Te≳1; the observed growth rates show no reduction compared to the hydromagnetic limit. To obtain this result for the case of negative shear (v0y’/Ωi<0), it is necessary to include the kinetic modifications to the structure of the shear layer equilibrium. For finite k∥ in the range 0
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
