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Direct evidence of nonstationary collisionless shocks in space plasmas

Collisionless shocks are ubiquitous throughout the universe: around stars, supernova remnants, active galactic nuclei, binary systems, comets, and planets. Key information is carried by electromagnetic emissions from particles accelerated by high Mach number collisionless shocks. These shocks are in...

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Autores principales: Dimmock, Andrew P., Russell, Christopher T., Sagdeev, Roald Z., Krasnoselskikh, Vladimir, Walker, Simon N., Carr, Christopher, Dandouras, Iannis, Escoubet, C. Philippe, Ganushkina, Natalia, Gedalin, Michael, Khotyaintsev, Yuri V., Aryan, Homayon, Pulkkinen, Tuija I., Balikhin, Michael A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6392793/
https://www.ncbi.nlm.nih.gov/pubmed/30820454
http://dx.doi.org/10.1126/sciadv.aau9926
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author Dimmock, Andrew P.
Russell, Christopher T.
Sagdeev, Roald Z.
Krasnoselskikh, Vladimir
Walker, Simon N.
Carr, Christopher
Dandouras, Iannis
Escoubet, C. Philippe
Ganushkina, Natalia
Gedalin, Michael
Khotyaintsev, Yuri V.
Aryan, Homayon
Pulkkinen, Tuija I.
Balikhin, Michael A.
author_facet Dimmock, Andrew P.
Russell, Christopher T.
Sagdeev, Roald Z.
Krasnoselskikh, Vladimir
Walker, Simon N.
Carr, Christopher
Dandouras, Iannis
Escoubet, C. Philippe
Ganushkina, Natalia
Gedalin, Michael
Khotyaintsev, Yuri V.
Aryan, Homayon
Pulkkinen, Tuija I.
Balikhin, Michael A.
author_sort Dimmock, Andrew P.
collection PubMed
description Collisionless shocks are ubiquitous throughout the universe: around stars, supernova remnants, active galactic nuclei, binary systems, comets, and planets. Key information is carried by electromagnetic emissions from particles accelerated by high Mach number collisionless shocks. These shocks are intrinsically nonstationary, and the characteristic physical scales responsible for particle acceleration remain unknown. Quantifying these scales is crucial, as it affects the fundamental process of redistributing upstream plasma kinetic energy into other degrees of freedom—particularly electron thermalization. Direct in situ measurements of nonstationary shock dynamics have not been reported. Thus, the model that best describes this process has remained unknown. Here, we present direct evidence demonstrating that the transition to nonstationarity is associated with electron-scale field structures inside the shock ramp.
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spelling pubmed-63927932019-02-28 Direct evidence of nonstationary collisionless shocks in space plasmas Dimmock, Andrew P. Russell, Christopher T. Sagdeev, Roald Z. Krasnoselskikh, Vladimir Walker, Simon N. Carr, Christopher Dandouras, Iannis Escoubet, C. Philippe Ganushkina, Natalia Gedalin, Michael Khotyaintsev, Yuri V. Aryan, Homayon Pulkkinen, Tuija I. Balikhin, Michael A. Sci Adv Research Articles Collisionless shocks are ubiquitous throughout the universe: around stars, supernova remnants, active galactic nuclei, binary systems, comets, and planets. Key information is carried by electromagnetic emissions from particles accelerated by high Mach number collisionless shocks. These shocks are intrinsically nonstationary, and the characteristic physical scales responsible for particle acceleration remain unknown. Quantifying these scales is crucial, as it affects the fundamental process of redistributing upstream plasma kinetic energy into other degrees of freedom—particularly electron thermalization. Direct in situ measurements of nonstationary shock dynamics have not been reported. Thus, the model that best describes this process has remained unknown. Here, we present direct evidence demonstrating that the transition to nonstationarity is associated with electron-scale field structures inside the shock ramp. American Association for the Advancement of Science 2019-02-27 /pmc/articles/PMC6392793/ /pubmed/30820454 http://dx.doi.org/10.1126/sciadv.aau9926 Text en Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Dimmock, Andrew P.
Russell, Christopher T.
Sagdeev, Roald Z.
Krasnoselskikh, Vladimir
Walker, Simon N.
Carr, Christopher
Dandouras, Iannis
Escoubet, C. Philippe
Ganushkina, Natalia
Gedalin, Michael
Khotyaintsev, Yuri V.
Aryan, Homayon
Pulkkinen, Tuija I.
Balikhin, Michael A.
Direct evidence of nonstationary collisionless shocks in space plasmas
title Direct evidence of nonstationary collisionless shocks in space plasmas
title_full Direct evidence of nonstationary collisionless shocks in space plasmas
title_fullStr Direct evidence of nonstationary collisionless shocks in space plasmas
title_full_unstemmed Direct evidence of nonstationary collisionless shocks in space plasmas
title_short Direct evidence of nonstationary collisionless shocks in space plasmas
title_sort direct evidence of nonstationary collisionless shocks in space plasmas
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6392793/
https://www.ncbi.nlm.nih.gov/pubmed/30820454
http://dx.doi.org/10.1126/sciadv.aau9926
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