Turbulent dipolarization regions in the Earth’s magnetotail: ion fluxes and magnetic field changes

IF 2.6 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Liudmyla Kozak, Elena A. Kronberg, Bohdan Petrenko, Aljona Blöcker, Roman Akhmetshyn, Istvan Ballai, Viktor Fedun
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Abstract

In this work, we consider the dynamics of ion fluxes and magnetic field changes in turbulent regions of magnetotail dipolarizations. The data from the Cluster-II mission (magnetic field measurements from fluxgate magnetometers and energetic charged particle observations from RAPID spectrometers) were used for the analysis. We study individual events and investigate statistically the changes of charged particle fluxes during magnetic field dipolarizations observed during 2001–2015. Received changes in the spectral index indicate that CNO+ ions undergo stronger acceleration during dipolarization than protons and helium ions. Before dipolarization front monotonic growth the ions flux is observed (the maximum of flux is observed at 1–1,5 min after the start of dipolarization) in the range of ∼ 92–374 keV for proton; in the energy range ∼ 138–235 keV for He+ and in the energy range of 414–638 keV for CNO+ ions. Flux increase before arriving dipolarization front may result from the reflection of plasma sheet ions at the dipolarization front and the result of the resonant interactions of ions with low-frequency electromagnetic waves.
地球磁尾中的湍流双极化区:离子通量和磁场变化
在这项工作中,我们考虑了离子通量的动力学和磁场的变化在磁尾双极化的湍流区域。分析使用了群集ii任务的数据(磁通门磁力计的磁场测量和RAPID光谱仪的高能带电粒子观测)。我们研究了单个事件,并统计研究了2001-2015年观测到的磁场双极化期间带电粒子通量的变化。接收到的光谱指数变化表明,CNO+离子在双极化过程中比质子和氦离子承受更强的加速度。在双极化锋单调生长前,质子的离子通量在~ 92-374 keV范围内(在双极化开始后1 - 1,5 min达到最大值);He+在~ 138 ~ 235 keV的能量范围内,CNO+在414 ~ 638 keV的能量范围内。到达双极化锋前的通量增加可能是等离子体片离子在双极化锋处的反射和离子与低频电磁波共振相互作用的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Astronomy and Space Sciences
Frontiers in Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-
CiteScore
3.40
自引率
13.30%
发文量
363
审稿时长
14 weeks
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