Magnetic turbulence and particle dynamics in the Earth’s magnetotail

The influence of magnetic turbulence in the near-Earth magnetotail on ion motion is investigated by numerical simulation. The magnetotail current sheet is modelled as a magnetic field reversal with a normal magnetic field com-ponent <i>Bn</i> , plus a three-dimensional spectrum o...

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Main Authors:	G. Zimbardo, A. Greco, A. L. Taktakishvili, P. Veltri, L. M. Zelenyi
Format:	Article
Language:	English
Published:	Copernicus Publications 2003-09-01
Series:	Annales Geophysicae
Online Access:	https://www.ann-geophys.net/21/1947/2003/angeo-21-1947-2003.pdf

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spelling	doaj-d649008b9cb9407a8a73f5a361b6675c2020-11-24T22:37:42ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762003-09-01211947195310.5194/angeo-21-1947-2003Magnetic turbulence and particle dynamics in the Earth’s magnetotailG. Zimbardo0G. Zimbardo1A. Greco2A. Greco3A. L. Taktakishvili4P. Veltri5P. Veltri6L. M. Zelenyi7Physics Department, University of Calabria, Ponte P. Bucci, Cubo 31C, I-87036 Rende, Italyalso at: Istituto Nazionale di Fisica della Materia, Unita’ di Cosenza, ItalyPhysics Department, University of Calabria, Ponte P. Bucci, Cubo 31C, I-87036 Rende, Italyalso at: Istituto Nazionale di Fisica della Materia, Unita’ di Cosenza, ItalyAbastumani Astrophysical Observatory, A. Kazbegi str., 2a, 380060, Tbilisi, GeorgiaPhysics Department, University of Calabria, Ponte P. Bucci, Cubo 31C, I-87036 Rende, Italyalso at: Istituto Nazionale di Fisica della Materia, Unita’ di Cosenza, ItalySpace Research Institute, Profsoyuznaya 84/32, 117810 Moscow, RussiaThe influence of magnetic turbulence in the near-Earth magnetotail on ion motion is investigated by numerical simulation. The magnetotail current sheet is modelled as a magnetic field reversal with a normal magnetic field com-ponent <i>Bn</i> , plus a three-dimensional spectrum of magnetic fluctuations <b><font face="Symbol">d</font>B </b>which represents the observed magnetic turbulence. The dawn-dusk electric field <i>Ey</i> is also considered. A test particle simulation is performed using different values of <i>Bn</i> and of the fluctuation level <b><font face="Symbol">d</font></b>B/B<sub>0</sub>. We show that when the magnetic fluctuations are taken into account, the particle dynamics is deeply affected, giving rise to an increase in the cross tail transport, ion heating, and current sheet thickness. For strong enough turbulence, the current splits in two layers, in agreement with recent Cluster observations.<br><br><b>Key words. </b>Magnetospheric physics (magnetospheric configuration and dynamics) – Interplanetary physics (MHD waves and turbulence) – Electromagnetics (numerical methods)https://www.ann-geophys.net/21/1947/2003/angeo-21-1947-2003.pdf
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	G. Zimbardo G. Zimbardo A. Greco A. Greco A. L. Taktakishvili P. Veltri P. Veltri L. M. Zelenyi
spellingShingle	G. Zimbardo G. Zimbardo A. Greco A. Greco A. L. Taktakishvili P. Veltri P. Veltri L. M. Zelenyi Magnetic turbulence and particle dynamics in the Earth’s magnetotail Annales Geophysicae
author_facet	G. Zimbardo G. Zimbardo A. Greco A. Greco A. L. Taktakishvili P. Veltri P. Veltri L. M. Zelenyi
author_sort	G. Zimbardo
title	Magnetic turbulence and particle dynamics in the Earth’s magnetotail
title_short	Magnetic turbulence and particle dynamics in the Earth’s magnetotail
title_full	Magnetic turbulence and particle dynamics in the Earth’s magnetotail
title_fullStr	Magnetic turbulence and particle dynamics in the Earth’s magnetotail
title_full_unstemmed	Magnetic turbulence and particle dynamics in the Earth’s magnetotail
title_sort	magnetic turbulence and particle dynamics in the earth’s magnetotail
publisher	Copernicus Publications
series	Annales Geophysicae
issn	0992-7689 1432-0576
publishDate	2003-09-01
description	The influence of magnetic turbulence in the near-Earth magnetotail on ion motion is investigated by numerical simulation. The magnetotail current sheet is modelled as a magnetic field reversal with a normal magnetic field com-ponent <i>Bn</i> , plus a three-dimensional spectrum of magnetic fluctuations <b><font face="Symbol">d</font>B </b>which represents the observed magnetic turbulence. The dawn-dusk electric field <i>Ey</i> is also considered. A test particle simulation is performed using different values of <i>Bn</i> and of the fluctuation level <b><font face="Symbol">d</font></b>B/B<sub>0</sub>. We show that when the magnetic fluctuations are taken into account, the particle dynamics is deeply affected, giving rise to an increase in the cross tail transport, ion heating, and current sheet thickness. For strong enough turbulence, the current splits in two layers, in agreement with recent Cluster observations.<br><br><b>Key words. </b>Magnetospheric physics (magnetospheric configuration and dynamics) – Interplanetary physics (MHD waves and turbulence) – Electromagnetics (numerical methods)
url	https://www.ann-geophys.net/21/1947/2003/angeo-21-1947-2003.pdf
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Magnetic turbulence and particle dynamics in the Earth’s magnetotail

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