DOI: 10.1002/2015GL066167
论文题名: Heavy ion acceleration at dipolarization fronts in planetary magnetotails
作者: Greco A. ; Artemyev A. ; Zimbardo G.
刊名: Geophysical Research Letters
ISSN: 0094-9580
EISSN: 1944-9311
出版年: 2015
卷: 42, 期: 20 起始页码: 8280
结束页码: 8287
语种: 英语
英文关键词: heavy ions
; magnetotail
; numerical model
; particle acceleration
; planetary magnetospheres
Scopus关键词: Acceleration
; Fighter aircraft
; Magnetosphere
; Numerical models
; Plasma jets
; Dipolarization
; Front velocity
; Injection energy
; Ion accelerations
; Magnetotails
; Particle acceleration
; Planetary magnetosphere
; Test particles
; Heavy ions
; jet
; magnetization
; magnetotail
; nucleation
; numerical model
; particle motion
; particle size
; polarization
; two-dimensional modeling
英文摘要: Transient reconnection events in planetary magnetotails give rise to fast plasma jets, whose leading edges are called dipolarization fronts. We perform a test particle simulation of the acceleration of several ion species (H+, He+, and O+) in a 2-D model of dipolarization fronts. We study the dependence of the acceleration on parameters of the model, finding, e.g., that the average ion energy increases with the front velocity and with the initial injection energy. When the ion species are initially cold, O+ ions get the largest amount of average energy. Conversely, when the injection energy of O+ ions is increased, their average energy gain does not exceed that of the lighter species, suggesting that ion energization at local dipolarization fronts strongly depends on the initial particle gyroradius. Further, the energy gained by the most energetic fraction of particles scales approximately as the square root of the mass ratio. Key Points We study heavy ion acceleration in a 2-D model of dipolarization front Ion energization at local dipolarization fronts strongly depends on initial particle gyroradius Our modeling shows that heavy ions are accelerated more effectively than protons © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946594154&doi=10.1002%2f2015GL066167&partnerID=40&md5=052ee8d5329c3e09de4cef0434145730
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9195
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: Dipartimento di Fisica, Università della Calabria, Rende, Italy
Recommended Citation:
Greco A.,Artemyev A.,Zimbardo G.. Heavy ion acceleration at dipolarization fronts in planetary magnetotails[J]. Geophysical Research Letters,2015-01-01,42(20).