DOI: 10.1002/2015GL063999
论文题名: Magnetic forces associated with bursty bulk flows in Earth's magnetotail
作者: Karlsson T. ; Hamrin M. ; Nilsson H. ; Kullen A. ; Pitkänen T.
刊名: Geophysical Research Letters
ISSN: 0094-9238
EISSN: 1944-8969
出版年: 2015
卷: 42, 期: 9 起始页码: 3122
结束页码: 3128
语种: 英语
英文关键词: bursty bulk flows
; Cluster
; curlometer
; multipoint measurements
Scopus关键词: Magnetic fields
; Magnetism
; Magnetosphere
; Pressure gradient
; Bursty bulk flow
; Cluster
; Curlometer
; Direct measurement
; Earth's magnetotail
; Inner magnetosphere
; Magnetic field pressure
; Multipoint measurement
; Magnetoplasma
; acceleration
; magnetic field
; magnetic intensity
; magnetotail
; plasma
英文摘要: We present the first direct measurements of magnetic forces acting on bursty bulk flow plasma in the magnetotail. The magnetic forces are determined using Cluster multispacecraft measurements. We analyze 67 bursty bulk flow (BBF) events and show that the curvature part of the magnetic force is consistently positive, acting to accelerate the plasma toward Earth between approximately 10 and 20 RE geocentrical distances, while the magnetic field pressure gradient increasingly brakes the plasma as it moves toward Earth. The net result is that the magnetic force accelerates the plasma at distances greater than approximately 14 RE , while it acts to decelerate it within that distance. The magnetic force, together with the thermal pressure gradient force, will determine the dynamics of the BBFs as they propagate toward the near-Earth tail region. The determination of the former provides an important clue to the ultimate fate of BBFs in the inner magnetosphere. Key Points Direct measurements of magnetic force acting on BBF plasma BBF plasma is accelerated toward Earth until it reaches 15 RE , then braked Knowledge of the forces on BBFs provides clue to their fate close to Earth ©2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930477445&doi=10.1002%2f2015GL063999&partnerID=40&md5=12508fdc82cdcfa935950a019478301f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8854
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Space and Plasma Physics, School of Electrical Engineering, Royal Institute of Technology, Stockholm, Sweden
Recommended Citation:
Karlsson T.,Hamrin M.,Nilsson H.,et al. Magnetic forces associated with bursty bulk flows in Earth's magnetotail[J]. Geophysical Research Letters,2015-01-01,42(9).