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Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons
Tang, Jianfei1,2,3; Wu, Dejin2; Zhao, Guoqing2; Chen, Ling2; Tan, Chengming3
2014-09-01
Source PublicationASTROPHYSICS AND SPACE SCIENCE
Volume353Issue:1Pages:131-135
Contribution Rank1
AbstractLangmuir waves (LWs), which are believed to play a crucial role in the plasma emission of solar radio bursts, can be excited by streaming instability of energetic electron beams. However, solar hard X-ray observations imply that the energetic flare electrons usually have a power-law energy distribution with a lower energy cutoff. In this paper, we investigate LWs driven by the power-law electrons. The results show that power-law electrons with the steepness cutoff behavior can excite LWs effectively because of the population inversion distribution below the cutoff energy (E (c) ). The growth rate of LWs increases with the steepness index (delta) and decreases with the power-law index (alpha). The wave number of the fastest growing LWs (k lambda (D) ), decreases with the characteristic velocity of the power-law electrons () and increases with the thermal velocity of ambient electrons (v (T) ). This can be helpful for us to understand better the physics of LWs and the dynamics of energetic electron beams in space and astrophysical plasmas.
KeywordInstabilities Radiation Mechanisms: Non-thermal Waves Sun: Radio Radiation
SubtypeArticle
DOI10.1007/s10509-014-1998-4
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordSOLAR RADIO-EMISSION ; HARD X-RAY ; STOCHASTIC-GROWTH THEORY ; PLASMA EMISSION ; BURSTS ; FLARES ; RADIATION ; MECHANISM
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000339969100015
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/596
Collection光学天文与技术应用研究室
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Tang, Jianfei,Wu, Dejin,Zhao, Guoqing,et al. Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons[J]. ASTROPHYSICS AND SPACE SCIENCE,2014,353(1):131-135.
APA Tang, Jianfei,Wu, Dejin,Zhao, Guoqing,Chen, Ling,&Tan, Chengming.(2014).Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons.ASTROPHYSICS AND SPACE SCIENCE,353(1),131-135.
MLA Tang, Jianfei,et al."Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons".ASTROPHYSICS AND SPACE SCIENCE 353.1(2014):131-135.
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