DOI: 10.1002/2015GL066689
论文题名: A multiscale study of ion heating in Earth's magnetotail
作者: Lapenta G. ; Ashour-Abdalla M. ; Walker R.J. ; El Alaoui M.
刊名: Geophysical Research Letters
ISSN: 0094-9432
EISSN: 1944-9163
出版年: 2016
卷: 43, 期: 2 起始页码: 515
结束页码: 524
语种: 英语
英文关键词: 3-D reconnection
; fluid-kinetic coupling
; ion heating
; magnetotail
; multiscale
Scopus关键词: Distribution functions
; Electric fields
; Heating
; Kinetics
; Magnetohydrodynamics
; Plasma heating
; 3-D reconnection
; Ion Heating
; Kinetic coupling
; Magnetotails
; Multiscale
; Ions
; coupling
; geoelectric field
; heating
; magnetohydrodynamics
; magnetotail
; numerical model
; polarization
; three-dimensional modeling
英文摘要: Ion heating during a substorm on 15 February 2008, starting at 0348 UT, is studied with a new approach recently described in Ashour-Abdalla et al. (2015). The general conditions of the magnetotail are obtained from a global magnetohydrodynamic (MHD) model and are used to drive a full kinetic particle-in-cell (PIC) simulation of a 3-D region of the tail. Within the kinetic box, the ions, the electrons, and the fields evolve self-consistently. The large scales are captured by the MHD model and the small scales by the PIC model based on the MHD state. This approach is used to study ion heating. Different heating mechanisms were analyzed by examining the velocity distributions at different locations. In the x direction heating occurs as the reconnection-generated ion jet interacts with the environment in which it propagates. The heating is found mostly in the separatrices and increases downstream of the reconnection region. In the y direction the heating is less intense and is found near the dipolarization fronts. It occurs as ions become magnetized and gyrotropize the distribution function. In addition, ions can be heated in the y direction by the reconnection electric field near the reconnection site. In the z direction the ions are heated by the formation of beams moving along z between the separatrices. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956699438&doi=10.1002%2f2015GL066689&partnerID=40&md5=9fa63459def08cfb1691856a732b2f7a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10395
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: Center for Mathematical Plasma Astrophysics, Departement Wiskunde, University of Leuven, Leuven, Belgium
Recommended Citation:
Lapenta G.,Ashour-Abdalla M.,Walker R.J.,et al. A multiscale study of ion heating in Earth's magnetotail[J]. Geophysical Research Letters,2016-01-01,43(2).