How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission

被引:28
作者
Che, Haihong [1 ,2 ]
Goldstein, Melvyn L. [2 ]
Diamond, Patrick H. [3 ]
Sagdeev, Roald Z. [4 ]
机构
[1] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[2] NASA, Goddard Space Flight Ctr, Heliospher Phys Lab, Greenbelt, MD 20771 USA
[3] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[4] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
关键词
electron beams; nonlinear wave interaction; Langmuir collapse; coherent emission; plasma turbulence; III RADIO-BURSTS; NONLINEAR STABILITY; WAVE COLLAPSE; SOLAR; PLASMA; RADIATION;
D O I
10.1073/pnas.1614055114
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Continuous plasma coherent emission is maintained by repetitive Langmuir collapse driven by the nonlinear evolution of a strong electron two-stream instability. The Langmuir waves are modulated by solitary waves in the linear stage and electrostatic whistler waves in the nonlinear stage. Modulational instability leads to Langmuir collapse and electron heating that fills in cavitons. The high pressure is released via excitation of a short-wavelength ion acoustic mode that is damped by electrons and reexcites small-scale Langmuir waves; this process closes a feedback loop that maintains the continuous coherent emission.
引用
收藏
页码:1502 / 1507
页数:6
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