PMO OpenIR  > 太阳和太阳系等离子体研究团组
Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma
Chen, L.1,2; Wu, D. J.1; Huang, J.2
2013-06-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume118Issue:6Pages:2951-2957
AbstractKinetic Alfven waves (KAWs) can play an important role in the energization of plasma particles and the formation of filamentous structures, which commonly are encountered and frequently accompanied by field-aligned currents in various magneto-plasmas, such as laboratory, auroral, and coronal plasmas. Based on a low-frequency kinetic dispersion equation in frequency omega < omega(ci) (the ion cyclotron frequency), KAW instability driven by a field-aligned current, which is carried by the field-aligned drift of electrons at velocity V-D, is investigated in a low-beta plasma of beta < Q << 1, where beta is the kinetic-to-magnetic pressure ratio and Q (equivalent to m(e)/m(i) << 1) is the mass ratio of electrons to ions. An instability condition and the corresponding growth rate are obtained, which depends on the plasma beta parameter as well as the drift velocity V-D. The results show that the KAW instability occurs in the perpendicular wave number range of k(perpendicular to)(-) < k(perpendicular to) < k(perpendicular to)(+), in which the growth rate reaches its maximum at k(perpendicular to)(m) for fixed V-D and beta. As V-D increases, this growing wave number range widens and the growth rate increases, but the maximal-growing wave number k(perpendicular to)(m) decreases. On the other hand, as the plasma beta parameter decreases, the growing wave number range also widens, and the maximal-growing wave number and growth rate both increase. These results have potential importance in understanding the physics of the electric current dissipation and plasma active phenomena since the field-aligned current is one of the most active factors in space and astrophysical plasmas.
KeywordKinetic Alfven Wave Instability Field-aligned Currents
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/jgra.50332
WOS KeywordAURORAL ELECTRON ACCELERATION ; CORONAL LOOP OSCILLATIONS ; INTERSTELLAR TURBULENCE ; HOSE INSTABILITY ; HEAVY-IONS ; ENERGIZATION ; IDENTIFICATION ; EXCITATION ; RESONANCE ; REGION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000325217100021
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15525
Collection太阳和太阳系等离子体研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Chen, L.,Wu, D. J.,Huang, J.. Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2013,118(6):2951-2957.
APA Chen, L.,Wu, D. J.,&Huang, J..(2013).Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,118(6),2951-2957.
MLA Chen, L.,et al."Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118.6(2013):2951-2957.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Chen, L.]'s Articles
[Wu, D. J.]'s Articles
[Huang, J.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Chen, L.]'s Articles
[Wu, D. J.]'s Articles
[Huang, J.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Chen, L.]'s Articles
[Wu, D. J.]'s Articles
[Huang, J.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.