SUNWARD-PROPAGATING ALFVENIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE

doi:10.3847/2041-8205/824/1/L2

CORC > 北京大学 > 地球与空间科学学院

	SUNWARD-PROPAGATING ALFVENIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE
	Li, Hui ; Wang, Chi ; Belcher, John W. ; He, Jiansen ; Richardson, John D.
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2016
关键词	magnetic fields magnetohydrodynamics (MHD) plasmas solar wind turbulence waves SOLAR-WIND TURBULENCE RADIAL EVOLUTION 1 AU WAVES SPACECRAFT OUTWARD PLASMA
DOI	10.3847/2041-8205/824/1/L2
英文摘要	The mixture/interaction of anti-sunward-propagating Alfvenic fluctuations (AFs) and sunward-propagating Alfvenic fluctuations (SAFs) is believed to result in the decrease of the Alfvenicity of solar wind fluctuations with increasing heliocentric distance. However, SAFs are rarely observed at 1 au and solar wind AFs are found to be generally outward. Using the measurements from Voyager 2 and Wind, we perform a statistical survey of SAFs in the heliosphere inside 6 au. We first report two SAF events observed by Voyager 2. One is in the anti-sunward magnetic sector with a strong positive correlation between the fluctuations of magnetic field and solar wind velocity. The other one is in the sunward magnetic sector with a strong negative magnetic field-velocity correlation. Statistically, the percentage of SAFs increases gradually with heliocentric distance, from about 2.7% at 1.0 au to about 8.7% at 5.5 au. These results provide new clues for understanding the generation mechanism of SAFs.; 973 program [2012CB825602]; NNSFC [41574169, 41231067]; Youth Innovation Promotion Association of the Chinese Academy of Sciences; Specialized Research Fund for State Key Laboratories of China; SCI(E); ARTICLE; hli@spaceweather.ac.cn; 1; 824
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/492174]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Li, Hui,Wang, Chi,Belcher, John W.,et al. SUNWARD-PROPAGATING ALFVENIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE[J]. ASTROPHYSICAL JOURNAL LETTERS,2016.
APA	Li, Hui,Wang, Chi,Belcher, John W.,He, Jiansen,&Richardson, John D..(2016).SUNWARD-PROPAGATING ALFVENIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE.ASTROPHYSICAL JOURNAL LETTERS.
MLA	Li, Hui,et al."SUNWARD-PROPAGATING ALFVENIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE".ASTROPHYSICAL JOURNAL LETTERS (2016).