SUNWARD PROPAGATING ALFVEN WAVES IN ASSOCIATION WITH SUNWARD DRIFTING   PROTON BEAMS IN THE SOLAR WIND

doi:10.1088/0004-637X/805/2/176

CORC > 北京大学 > 地球与空间科学学院

	SUNWARD PROPAGATING ALFVEN WAVES IN ASSOCIATION WITH SUNWARD DRIFTING PROTON BEAMS IN THE SOLAR WIND
	He, Jiansen ; Pei, Zhongtian ; Wang, Linghua ; Tu, Chuanyi ; Marsch, Eckart ; Zhang, Lei ; Salem, Chadi
刊名	ASTROPHYSICAL JOURNAL
	2015
关键词	solar wind turbulence waves EARTHS BOW SHOCK MAGNETIC HELICITY MAGNETOHYDRODYNAMIC TURBULENCE ION INSTABILITIES CYCLOTRON WAVES CROSS-HELICITY ULF WAVES FORESHOCK FLUCTUATIONS UPSTREAM
DOI	10.1088/0004-637X/805/2/176
英文摘要	Using measurements from the WIND spacecraft, here we report the observation of sunward propagating Alfven waves (AWs) in solar wind that is magnetically disconnected from the Earth's bow shock. In the sunward magnetic field sector, we find a period lasting for more than three days in which there existed (during most time intervals) a negative correlation between the flow velocity and magnetic field fluctuations, thus indicating that the related AWs are mainly propagating sunward. Simultaneous observations of counter-streaming suprathermal electrons suggest that these sunward AWs may not simply be due to the deflection of an open magnetic field line. Moreover, no interplanetary coronal mass ejection appears to be associated with the counter-streaming suprathermal electrons. As the scale goes from the magnetohydrodynamic down to the ion kinetic regime, the wave vector of magnetic fluctuations usually becomes more orthogonal to the mean magnetic field direction, and the fluctuations become increasingly compressible, which are both features consistent with quasi-perpendicular kinetic AWs. However, in the case studied here, we find clear signatures of quasi-parallel sunward propagating ion-cyclotron waves. Concurrently, the solar wind proton velocity distribution reveals a sunward field-aligned beam that drifts at about the local Alfven speed. This beam is found to run in the opposite direction of the normally observed (anti-sunward) proton beam, and is apparently associated with sunward propagating Alfven/ion-cyclotron waves. The results and conclusions of this study enrich our knowledge of solar wind turbulence and foster our understanding of proton heating and acceleration within a complex magnetic field geometry.; NSFC [41222032, 41174148, 41231069, 41274172, 41474148, 41421003]; SCI(E); ARTICLE; jshept@gmail.com; 2; 805
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/419659]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	He, Jiansen,Pei, Zhongtian,Wang, Linghua,et al. SUNWARD PROPAGATING ALFVEN WAVES IN ASSOCIATION WITH SUNWARD DRIFTING PROTON BEAMS IN THE SOLAR WIND[J]. ASTROPHYSICAL JOURNAL,2015.
APA	He, Jiansen.,Pei, Zhongtian.,Wang, Linghua.,Tu, Chuanyi.,Marsch, Eckart.,...&Salem, Chadi.(2015).SUNWARD PROPAGATING ALFVEN WAVES IN ASSOCIATION WITH SUNWARD DRIFTING PROTON BEAMS IN THE SOLAR WIND.ASTROPHYSICAL JOURNAL.
MLA	He, Jiansen,et al."SUNWARD PROPAGATING ALFVEN WAVES IN ASSOCIATION WITH SUNWARD DRIFTING PROTON BEAMS IN THE SOLAR WIND".ASTROPHYSICAL JOURNAL (2015).