A direct examination of the dynamics of dipolarization fronts using MMS

doi:10.1002/2016JA023401

CORC > 北京大学 > 地球与空间科学学院

	A direct examination of the dynamics of dipolarization fronts using MMS
	Yao, Z. H. ; Rae, I. J. ; Guo, R. L. ; Fazakerley, A. N. ; Owen, C. J. ; Nakamura, R. ; Baumjohann, W. ; Watt, C. E. J. ; Hwang, K. J. ; Giles, B. L. ; Russell, C. T. ; Torbert, R. B. ; Varsani, A. ; Fu, H. S. ; Shi, Q. Q. ; Zhang, X.J.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2017
关键词	ELECTROMAGNETIC ENERGY-CONVERSION FLUX PILEUP REGIONS EARTH PLASMA SHEET CLUSTER OBSERVATIONS MAGNETOSPHERIC MULTISCALE ELECTRON ACCELERATION MAGNETIC-FIELD RECONNECTION MAGNETOTAIL EVENT
DOI	10.1002/2016JA023401
英文摘要	Energy conversion on the dipolarization fronts (DFs) has attracted much research attention through the suggestion that intense current densities associated with DFs can modify the more global magnetotail current system. The current structures associated with a DF are at the scale of one to a few ion gyroradii, and their duration is comparable to a spacecraft's spin period. Hence, it is crucial to understand the physical mechanisms of DFs with measurements at a timescale shorter than a spin period. We present a case study whereby we use measurements from the Magnetospheric Multiscale (MMS) Mission, which provides full 3-D particle distributions with a cadence much shorter than a spin period. We provide a cross validation amongst the current density calculations and examine the assumptions that have been adopted in previous literature using the advantages of MMS mission (i. e., small-scale tetrahedron and high temporal resolution). We also provide a cross validation on the terms in the generalized Ohm's law using these advantageous measurements. Our results clearly show that the majority of the currents on the DF are contributed by both ion and electron diamagnetic drifts. Our analysis also implies that the ion frozen-in condition does not hold on the DF, while electron frozen-in condition likely holds. The new experimental capabilities allow us to accurately calculate Joule heating within the DF, which shows that plasma energy is being converted to magnetic energy in our event.; UK Science and Technology Facilities Council (STFC) at UCL/MSSL [ST/L005638/1]; European Union; STFC [ST/L000563/1, ST/M000885/1]; National Environmental Research Council (NERC) [NE/L007495/1]; MSSL [ST/N000722/1]; NSFC [41404117]; SCI(E); ARTICLE; 4; 4335-4347; 122
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/474179]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Yao, Z. H.,Rae, I. J.,Guo, R. L.,et al. A direct examination of the dynamics of dipolarization fronts using MMS[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2017.
APA	Yao, Z. H..,Rae, I. J..,Guo, R. L..,Fazakerley, A. N..,Owen, C. J..,...&Zhang, X.J..(2017).A direct examination of the dynamics of dipolarization fronts using MMS.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS.
MLA	Yao, Z. H.,et al."A direct examination of the dynamics of dipolarization fronts using MMS".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2017).