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Diffusion at the Earth Magnetopause: Enhancement by Kelvin-helmholtz Instability : Volume 25, Issue 1 (01/02/2007)

By Smets, R.

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Book Id: WPLBN0004001632
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Diffusion at the Earth Magnetopause: Enhancement by Kelvin-helmholtz Instability : Volume 25, Issue 1 (01/02/2007)  
Author: Smets, R.
Volume: Vol. 25, Issue 1
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Rezeau, L., Delcourt, D., Smets, R., & Belmont, G. (2007). Diffusion at the Earth Magnetopause: Enhancement by Kelvin-helmholtz Instability : Volume 25, Issue 1 (01/02/2007). Retrieved from http://members.worldlibrary.net/


Description
Description: CETP/CNRS/UVSQ/UPMC/IPSL, 10–12 Avenue de l'Europe, 78140 Vélizy, France. Using hybrid simulations, we examine how particles can diffuse across the Earth's magnetopause because of finite Larmor radius effects. We focus on tangential discontinuities and consider a reversal of the magnetic field that closely models the magnetopause under southward interplanetary magnetic field. When the Larmor radius is on the order of the field reversal thickness, we show that particles can cross the discontinuity. We also show that with a realistic initial shear flow, a Kelvin-Helmholtz instability develops that increases the efficiency of the crossing process. We investigate the distribution functions of the transmitted ions and demonstrate that they are structured according to a D-shape. It accordingly appears that magnetic reconnection at the magnetopause is not the only process that leads to such specific distribution functions. A simple analytical model that describes the built-up of these functions is proposed.

Summary
Diffusion at the Earth magnetopause: enhancement by Kelvin-Helmholtz instability

Excerpt
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