POSSIBLE EVIDENCE OF ALFVEN-CYCLOTRON WAVES IN THE ANGLE DISTRIBUTION OF   MAGNETIC HELICITY OF SOLAR WIND TURBULENCE

doi:10.1088/0004-637X/731/2/85

CORC > 北京大学 > 地球与空间科学学院

	POSSIBLE EVIDENCE OF ALFVEN-CYCLOTRON WAVES IN THE ANGLE DISTRIBUTION OF MAGNETIC HELICITY OF SOLAR WIND TURBULENCE
	He, Jiansen ; Marsch, Eckart ; Tu, Chuanyi ; Yao, Shuo ; Tian, Hui
刊名	astrophysical journal
	2011
关键词	solar wind turbulence waves MAGNETOHYDRODYNAMIC TURBULENCE MHD TURBULENCE CROSS-HELICITY DISSIPATION ANISOTROPY FIELD STEREO
DOI	10.1088/0004-637X/731/2/85
英文摘要	The fluctuating magnetic helicity is considered an important parameter in diagnosing the characteristic modes of solar wind turbulence. Among them is the Alfven-cyclotron wave, which is probably responsible for the solar wind plasma heating, but has not yet been identified from the magnetic helicity of solar wind turbulence. Here, we present the possible signatures of Alfven-cyclotron waves in the distribution of magnetic helicity as a function of theta(VB), which is the angle between the solar wind velocity and local mean magnetic field. We use magnetic field data from the STEREO spacecraft to calculate the theta(VB) distribution of the normalized reduced fluctuating magnetic helicity sigma(m). We find a dominant negative sigma(m) for 1 s < p < 4 s (p is time period) and for theta(VB) < 30 degrees in the solar wind outward magnetic sector, and a dominant positive sigma(m) for 0.4 s < p < 4 s and for theta(VB) > 150 degrees in the solar wind inward magnetic sector. These features of sigma(m) appearing around the Doppler-shifted ion-cyclotron frequencies may be consistent with the existence of Alfven-cyclotron waves among the outward propagating fluctuations. Moreover, right-handed polarized waves at larger propagation angles, which might be kinetic Alfven-waves or whistler waves, have also been identified on the basis of the sigma(m) features in the angular range 40 degrees < theta(VB) < 140 degrees. Our findings suggest that Alfven-cyclotron waves (together with other wave modes) play a prominent role in turbulence cascading and plasma heating of the solar wind.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000289779600008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Astronomy & Astrophysics; SCI(E); 73; ARTICLE; 2; 731
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311217]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	He, Jiansen,Marsch, Eckart,Tu, Chuanyi,et al. POSSIBLE EVIDENCE OF ALFVEN-CYCLOTRON WAVES IN THE ANGLE DISTRIBUTION OF MAGNETIC HELICITY OF SOLAR WIND TURBULENCE[J]. astrophysical journal,2011.
APA	He, Jiansen,Marsch, Eckart,Tu, Chuanyi,Yao, Shuo,&Tian, Hui.(2011).POSSIBLE EVIDENCE OF ALFVEN-CYCLOTRON WAVES IN THE ANGLE DISTRIBUTION OF MAGNETIC HELICITY OF SOLAR WIND TURBULENCE.astrophysical journal.
MLA	He, Jiansen,et al."POSSIBLE EVIDENCE OF ALFVEN-CYCLOTRON WAVES IN THE ANGLE DISTRIBUTION OF MAGNETIC HELICITY OF SOLAR WIND TURBULENCE".astrophysical journal (2011).