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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
ISSN0004-640X
Volume353Issue:1Pages:131-135
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
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s10509-014-1998-4
WOS KeywordSOLAR RADIO-EMISSION ; HARD X-RAY ; STOCHASTIC-GROWTH THEORY ; PLASMA EMISSION ; BURSTS ; FLARES ; RADIATION ; MECHANISM
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000339969100015
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10640
Collection太阳和太阳系等离子体研究团组
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
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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