DO OBLIQUE ALFVEN/ION-CYCLOTRON OR FAST-MODE/WHISTLER WAVES DOMINATE THE   DISSIPATION OF SOLAR WIND TURBULENCE NEAR THE PROTON INERTIAL LENGTH?

doi:10.1088/2041-8205/745/1/L8

CORC > 北京大学 > 地球与空间科学学院

	DO OBLIQUE ALFVEN/ION-CYCLOTRON OR FAST-MODE/WHISTLER WAVES DOMINATE THE DISSIPATION OF SOLAR WIND TURBULENCE NEAR THE PROTON INERTIAL LENGTH?
	He, Jiansen ; Tu, Chuanyi ; Marsch, Eckart ; Yao, Shuo
刊名	astrophysical journal letters
	2012
关键词	solar wind turbulence waves ELECTRON MAGNETOHYDRODYNAMIC TURBULENCE WEAKLY COLLISIONAL PLASMAS MAGNETIC HELICITY MHD ANISOTROPY ANGLE
DOI	10.1088/2041-8205/745/1/L8
英文摘要	To determine the wave modes prevailing in solar wind turbulence at kinetic scales, we study the magnetic polarization of small-scale fluctuations in the plane perpendicular to the data sampling direction (namely, the solar wind flow direction, V-SW) and analyze its orientation with respect to the local background magnetic field B-0,B- local. As an example, we take only measurements made in an outward magnetic sector. When B-0,B- local is quasi-perpendicular to V-SW, we find that the small-scale magnetic-field fluctuations, which have periods from about 1 to 3 s and are extracted from a wavelet decomposition of the original time series, show a polarization ellipse with right-handed orientation. This is consistent with a positive reduced magnetic helicity, as previously reported. Moreover, for the first time we find that the major axis of the ellipse is perpendicular to B-0,B- local, a property that is characteristic of an oblique Alfven wave rather than oblique whistler wave. For an oblique whistler wave, the major axis of the magnetic ellipse is expected to be aligned with B-0,B- local, thus indicating significant magnetic compressibility, and the polarization turns from right to left handedness as the wave propagation angle (theta(kB)) increases toward 90 degrees. Therefore, we conclude that the observation of a right-handed polarization ellipse with orientation perpendicular to B-0,B- local seems to indicate that oblique Alfven/ion-cyclotron waves rather than oblique fast-mode/whistler waves dominate in the "dissipation" range near the break of solar wind turbulence spectra occurring around the proton inertial length.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000300228100008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Astronomy & Astrophysics; SCI(E); 43; ARTICLE; 1; 745
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311464]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	He, Jiansen,Tu, Chuanyi,Marsch, Eckart,et al. DO OBLIQUE ALFVEN/ION-CYCLOTRON OR FAST-MODE/WHISTLER WAVES DOMINATE THE DISSIPATION OF SOLAR WIND TURBULENCE NEAR THE PROTON INERTIAL LENGTH?[J]. astrophysical journal letters,2012.
APA	He, Jiansen,Tu, Chuanyi,Marsch, Eckart,&Yao, Shuo.(2012).DO OBLIQUE ALFVEN/ION-CYCLOTRON OR FAST-MODE/WHISTLER WAVES DOMINATE THE DISSIPATION OF SOLAR WIND TURBULENCE NEAR THE PROTON INERTIAL LENGTH?.astrophysical journal letters.
MLA	He, Jiansen,et al."DO OBLIQUE ALFVEN/ION-CYCLOTRON OR FAST-MODE/WHISTLER WAVES DOMINATE THE DISSIPATION OF SOLAR WIND TURBULENCE NEAR THE PROTON INERTIAL LENGTH?".astrophysical journal letters (2012).