气候变化领域集成服务门户(CCPortal): Solitary Magnetic Structures at Quasi-Parallel Collisionless Shocks: Formation

CCPortal

DOI	10.1029/2020GL090800
	Solitary Magnetic Structures at Quasi-Parallel Collisionless Shocks: Formation
	Chen L.-J.; Wang S.; Ng J.; Bessho N.; Tang J.-M.; Fung S.F.; Le G.; Gershman D.; Giles B.; Russell C.T.; Torbert R.; Burch J.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:1
英文摘要	Solitary magnetic structures known as SLAMS (short large-amplitude magnetic structures) have been considered as essential elements of collisionless shocks with quasi-parallel geometries. Yet the physics underlying their formation remains an open question. In this paper, we use measurements from the magnetospheric multiscale mission combined with fully kinetic simulations to study the formation of SLAMS. We find that gyro-resonance between solar wind ions and right-hand circularly polarized electromagnetic waves results in magnetic field amplification. Gyro-trapping by the growing magnetic field buildup the plasma density that further enhances the current and field. The solitary nature of SLAMS stems from a beat-like magnetic field envelope where the maximum sets the initial location for nonlinear growth. Our results present a conceptual advance on SLAMS, and may shed new light on the open question of magnetic field amplification at astrophysical shocks. © 2020. The Authors.
英文关键词	Electromagnetic wave polarization; Electromagnetic waves; Gyroscopes; Magnetic fields; Magnetic structure; Magnetosphere; Plasma density; Shock waves; Circularly polarized electromagnetic waves; Collisionless shocks; Essential elements; Kinetic simulation; Large amplitude; Magnetic field amplification; Magnetospheric multiscale missions; Nonlinear growth; Magnetoplasma
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169279
作者单位	NASA Goddard Space Flight Center, Greenbelt, MD, United States; University of Maryland, College ParkMD, United States; iDirect Government, Herndon, VA, United States; University of California, Los Angeles, Los Angeles, CA, United States; University of New Hampshire, Durham, NH, United States; Southwest Research Institute, San Antonio, TX, United States
推荐引用方式 GB/T 7714	Chen L.-J.,Wang S.,Ng J.,et al. Solitary Magnetic Structures at Quasi-Parallel Collisionless Shocks: Formation[J],2021,48(1).
APA	Chen L.-J..,Wang S..,Ng J..,Bessho N..,Tang J.-M..,...&Burch J..(2021).Solitary Magnetic Structures at Quasi-Parallel Collisionless Shocks: Formation.Geophysical Research Letters,48(1).
MLA	Chen L.-J.,et al."Solitary Magnetic Structures at Quasi-Parallel Collisionless Shocks: Formation".Geophysical Research Letters 48.1(2021).