Magnetic-field aligned electric fields in collisionless space plasmas - a brief review

Magnetic-field aligned electric fields play an important role in the dynamics of magnetized plasmas. They allow decoupling of plasma elements by violation of the frozen field condition, breakdown of equipotential mapping, efficient acceleration of charged particles and rapid release of magnetic ener...

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Detalles Bibliográficos
Autor: Fälthammar, Carl Gunne
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2004
País:México
Institución:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
Repositorio:Geofísica Internacional
Idioma:español
inglés
OAI Identifier:oai:revistagi.geofisica.unam.mx:article/887
Acceso en línea:http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/887
Access Level:acceso abierto
Palabra clave:Campos magnéticos alineados
Campos eléctricos alineados
Magnetic-field aligned
Parallel electric fields
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spelling Magnetic-field aligned electric fields in collisionless space plasmas - a brief reviewMagnetic-field aligned electric fields in collisionless space plasmas - a brief reviewFälthammar, Carl GunneCampos magnéticos alineadosCampos eléctricos alineadosMagnetic-field alignedParallel electric fieldsMagnetic-field aligned electric fields play an important role in the dynamics of magnetized plasmas. They allow decoupling of plasma elements by violation of the frozen field condition, breakdown of equipotential mapping, efficient acceleration of charged particles and rapid release of magnetic energy. In the collisionless plasmas that occupy most of the universe they used to be assumed nonexistent. A major consequence of the in situ measurements of the space age was the recognition that such electric fields do exist in the collisionless space plasma in spite of the absence of collisional friction. Indications of their existence came even from ground observations, but the final proof rests on the overwhelming evidence accumulated by in situ observations. These include observations of a number of characteristic features of particle distribution functions, various active experiments and direct measurements of electric fields. A number of mechanisms that can support magnetic field aligned electric fields have been identified. They include wave turbulence, solitary structures, magnetic mirrors, electric double layers and dynamic trapping. Some of them have been observationally confirmed to be important in the auroral process, but their relative roles are still not well known.Los campos eléctricos alineados a los campos magnéticos juegan un importante papel en la dinámica de los plasmas magnetizados. Ellos permiten el desacoplamiento de los elementos de plasma debido a la violación de la condición de campo congelado, la ruptura del mapeo equipotencial, la eficiente aceleración de partículas cargadas y la liberación rápida de energía magnética. En los plasmas sin colisiones, que ocupan la mayor parte del universo, usualmente se asume que no existen. Sin embargo, una consecuencia muy importante de las mediciones in situ ha sido el reconocimiento de que tales campos eléctricos existen en los plasmas sin colisiones a pesar de la ausencia de la colisión friccional. Aunque indicios de su existencia están aún en mediciones en tierra, la prueba final está dada por la abrumadora evidencia de las observaciones in situ. Estas incluyen mediciones de algunos rasgos característicos de la función de distribución de las partículas, algunos experimentos y mediciones directas de estos campos eléctricos. Se han identificado algunos mecanismos que apoyan la existencia de estos campos eléctricos. Por ejemplo, la turbulencia, los solitones, los espejos magnéticos, las capas dobles y atrapamiento dinámico. Se ha observado que algunos de estos procesos son importantes en el fenómeno auroral, pero su importancia relativa aún no está bien entendida.Universidad Nacional Autónoma de México. Instituto de Geofísica2004-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/88710.22201/igeof.00167169p.2004.43.2.174Geofisica Internacional; Vol. 43 No. 2 (2004): April 1, 2004; 225-239Geofísica Internacional; Vol. 43 Núm. 2 (2004): Abril 1, 2004; 225-2392954-436X0016-716910.22201/igeof.00167169p.2004.43.2reponame:Geofísica Internacionalinstname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICOinstacron:UNAMspaenghttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/887/840http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/887/2586https://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccessoai:revistagi.geofisica.unam.mx:article/8872024-08-16T17:32:01Z
dc.title.none.fl_str_mv Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
title Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
spellingShingle Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
Fälthammar, Carl Gunne
Campos magnéticos alineados
Campos eléctricos alineados
Magnetic-field aligned
Parallel electric fields
title_short Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
title_full Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
title_fullStr Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
title_full_unstemmed Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
title_sort Magnetic-field aligned electric fields in collisionless space plasmas - a brief review
dc.creator.none.fl_str_mv Fälthammar, Carl Gunne
author Fälthammar, Carl Gunne
author_facet Fälthammar, Carl Gunne
author_role author
dc.subject.none.fl_str_mv Campos magnéticos alineados
Campos eléctricos alineados
Magnetic-field aligned
Parallel electric fields
topic Campos magnéticos alineados
Campos eléctricos alineados
Magnetic-field aligned
Parallel electric fields
description Magnetic-field aligned electric fields play an important role in the dynamics of magnetized plasmas. They allow decoupling of plasma elements by violation of the frozen field condition, breakdown of equipotential mapping, efficient acceleration of charged particles and rapid release of magnetic energy. In the collisionless plasmas that occupy most of the universe they used to be assumed nonexistent. A major consequence of the in situ measurements of the space age was the recognition that such electric fields do exist in the collisionless space plasma in spite of the absence of collisional friction. Indications of their existence came even from ground observations, but the final proof rests on the overwhelming evidence accumulated by in situ observations. These include observations of a number of characteristic features of particle distribution functions, various active experiments and direct measurements of electric fields. A number of mechanisms that can support magnetic field aligned electric fields have been identified. They include wave turbulence, solitary structures, magnetic mirrors, electric double layers and dynamic trapping. Some of them have been observationally confirmed to be important in the auroral process, but their relative roles are still not well known.
publishDate 2004
dc.date.none.fl_str_mv 2004-04-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/887
10.22201/igeof.00167169p.2004.43.2.174
url http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/887
identifier_str_mv 10.22201/igeof.00167169p.2004.43.2.174
dc.language.none.fl_str_mv spa
eng
language spa
eng
dc.relation.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/887/840
http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/887/2586
dc.rights.none.fl_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
dc.source.none.fl_str_mv Geofisica Internacional; Vol. 43 No. 2 (2004): April 1, 2004; 225-239
Geofísica Internacional; Vol. 43 Núm. 2 (2004): Abril 1, 2004; 225-239
2954-436X
0016-7169
10.22201/igeof.00167169p.2004.43.2
reponame:Geofísica Internacional
instname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron:UNAM
instname_str UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron_str UNAM
institution UNAM
reponame_str Geofísica Internacional
collection Geofísica Internacional
repository.name.fl_str_mv
repository.mail.fl_str_mv
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