Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock

Autores
Masters, A.; Arridge, C. S.; Dougherty, M. K.; Bertucci, Cesar; Billingham, L.; Schwartz, S. J.; Jackman, C. M.; Bebesi, Z.; Coates, A. J.; Thomsen, M. F.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Crossings of Saturn´s magnetopause made by the Cassini spacecraft on 12, 13 and 17 March 2006 are analysed. During this period Cassini´s trajectory was approximately parallel to the magnetopause boundary given by a model of the surface. Magnetic field and electron data are used to identify excursions into the magnetosheath bounded by crossings of the magnetopause current layer. Minimum variance analysis of the magnetic field vector measurements is used to determine the normal to the boundary for each crossing. The normals corresponding to the crossings oscillate about an average orientation that is consistent with the unperturbed normal predicted by the surface model. This reveals the presence of regular boundary waves with a direction of propagation found to be within 24° of Saturn´s rotational equator. Two categories of boundary wave are identified: the first with a period of the order of hours, and the second with a period of 45±9 min. Based on the propagation direction and a comparison of magnetospheric and magnetosheath magnetic fields, we conclude that both types of wave were driven by the Kelvin-Helmholtz instability. The observed boundary perturbations are consistent with a superposition of different types of surface wave activity.
Fil: Masters, A.. Imperial College London; Reino Unido
Fil: Arridge, C. S.. University College London; Estados Unidos
Fil: Dougherty, M. K.. Imperial College London; Reino Unido
Fil: Bertucci, Cesar. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Billingham, L.. Imperial College London; Reino Unido
Fil: Schwartz, S. J.. Imperial College London; Reino Unido
Fil: Jackman, C. M.. Imperial College London; Reino Unido
Fil: Bebesi, Z.. Research Institute for Particle and Nuclear Physics; Hungría
Fil: Coates, A. J.. University College London; Estados Unidos
Fil: Thomsen, M. F.. Los Alamos National Laboratory; Estados Unidos
Materia
Saturn
Magnetosphere
Magnetopause
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/20678
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shockMasters, A.Arridge, C. S.Dougherty, M. K.Bertucci, CesarBillingham, L.Schwartz, S. J.Jackman, C. M.Bebesi, Z.Coates, A. J.Thomsen, M. F.SaturnMagnetosphereMagnetopausehttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Crossings of Saturn´s magnetopause made by the Cassini spacecraft on 12, 13 and 17 March 2006 are analysed. During this period Cassini´s trajectory was approximately parallel to the magnetopause boundary given by a model of the surface. Magnetic field and electron data are used to identify excursions into the magnetosheath bounded by crossings of the magnetopause current layer. Minimum variance analysis of the magnetic field vector measurements is used to determine the normal to the boundary for each crossing. The normals corresponding to the crossings oscillate about an average orientation that is consistent with the unperturbed normal predicted by the surface model. This reveals the presence of regular boundary waves with a direction of propagation found to be within 24° of Saturn´s rotational equator. Two categories of boundary wave are identified: the first with a period of the order of hours, and the second with a period of 45±9 min. Based on the propagation direction and a comparison of magnetospheric and magnetosheath magnetic fields, we conclude that both types of wave were driven by the Kelvin-Helmholtz instability. The observed boundary perturbations are consistent with a superposition of different types of surface wave activity.Fil: Masters, A.. Imperial College London; Reino UnidoFil: Arridge, C. S.. University College London; Estados UnidosFil: Dougherty, M. K.. Imperial College London; Reino UnidoFil: Bertucci, Cesar. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Billingham, L.. Imperial College London; Reino UnidoFil: Schwartz, S. J.. Imperial College London; Reino UnidoFil: Jackman, C. M.. Imperial College London; Reino UnidoFil: Bebesi, Z.. Research Institute for Particle and Nuclear Physics; HungríaFil: Coates, A. J.. University College London; Estados UnidosFil: Thomsen, M. F.. Los Alamos National Laboratory; Estados UnidosAmerican Geophysical Union2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/20678Masters, A.; Arridge, C. S.; Dougherty, M. K.; Bertucci, Cesar; Billingham, L.; et al.; Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock; American Geophysical Union; Geophysical Research Letters; 35; 2; 12-2008; 1-60094-8276CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1029/2007GL032371info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1029/2007GL032371/abstractinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:41:13Zoai:ri.conicet.gov.ar:11336/20678instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 15:41:13.531CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
title Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
spellingShingle Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
Masters, A.
Saturn
Magnetosphere
Magnetopause
title_short Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
title_full Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
title_fullStr Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
title_full_unstemmed Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
title_sort Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
dc.creator.none.fl_str_mv Masters, A.
Arridge, C. S.
Dougherty, M. K.
Bertucci, Cesar
Billingham, L.
Schwartz, S. J.
Jackman, C. M.
Bebesi, Z.
Coates, A. J.
Thomsen, M. F.
author Masters, A.
author_facet Masters, A.
Arridge, C. S.
Dougherty, M. K.
Bertucci, Cesar
Billingham, L.
Schwartz, S. J.
Jackman, C. M.
Bebesi, Z.
Coates, A. J.
Thomsen, M. F.
author_role author
author2 Arridge, C. S.
Dougherty, M. K.
Bertucci, Cesar
Billingham, L.
Schwartz, S. J.
Jackman, C. M.
Bebesi, Z.
Coates, A. J.
Thomsen, M. F.
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Saturn
Magnetosphere
Magnetopause
topic Saturn
Magnetosphere
Magnetopause
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Crossings of Saturn´s magnetopause made by the Cassini spacecraft on 12, 13 and 17 March 2006 are analysed. During this period Cassini´s trajectory was approximately parallel to the magnetopause boundary given by a model of the surface. Magnetic field and electron data are used to identify excursions into the magnetosheath bounded by crossings of the magnetopause current layer. Minimum variance analysis of the magnetic field vector measurements is used to determine the normal to the boundary for each crossing. The normals corresponding to the crossings oscillate about an average orientation that is consistent with the unperturbed normal predicted by the surface model. This reveals the presence of regular boundary waves with a direction of propagation found to be within 24° of Saturn´s rotational equator. Two categories of boundary wave are identified: the first with a period of the order of hours, and the second with a period of 45±9 min. Based on the propagation direction and a comparison of magnetospheric and magnetosheath magnetic fields, we conclude that both types of wave were driven by the Kelvin-Helmholtz instability. The observed boundary perturbations are consistent with a superposition of different types of surface wave activity.
Fil: Masters, A.. Imperial College London; Reino Unido
Fil: Arridge, C. S.. University College London; Estados Unidos
Fil: Dougherty, M. K.. Imperial College London; Reino Unido
Fil: Bertucci, Cesar. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Billingham, L.. Imperial College London; Reino Unido
Fil: Schwartz, S. J.. Imperial College London; Reino Unido
Fil: Jackman, C. M.. Imperial College London; Reino Unido
Fil: Bebesi, Z.. Research Institute for Particle and Nuclear Physics; Hungría
Fil: Coates, A. J.. University College London; Estados Unidos
Fil: Thomsen, M. F.. Los Alamos National Laboratory; Estados Unidos
description Crossings of Saturn´s magnetopause made by the Cassini spacecraft on 12, 13 and 17 March 2006 are analysed. During this period Cassini´s trajectory was approximately parallel to the magnetopause boundary given by a model of the surface. Magnetic field and electron data are used to identify excursions into the magnetosheath bounded by crossings of the magnetopause current layer. Minimum variance analysis of the magnetic field vector measurements is used to determine the normal to the boundary for each crossing. The normals corresponding to the crossings oscillate about an average orientation that is consistent with the unperturbed normal predicted by the surface model. This reveals the presence of regular boundary waves with a direction of propagation found to be within 24° of Saturn´s rotational equator. Two categories of boundary wave are identified: the first with a period of the order of hours, and the second with a period of 45±9 min. Based on the propagation direction and a comparison of magnetospheric and magnetosheath magnetic fields, we conclude that both types of wave were driven by the Kelvin-Helmholtz instability. The observed boundary perturbations are consistent with a superposition of different types of surface wave activity.
publishDate 2008
dc.date.none.fl_str_mv 2008-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/20678
Masters, A.; Arridge, C. S.; Dougherty, M. K.; Bertucci, Cesar; Billingham, L.; et al.; Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock; American Geophysical Union; Geophysical Research Letters; 35; 2; 12-2008; 1-6
0094-8276
CONICET Digital
CONICET
url http://hdl.handle.net/11336/20678
identifier_str_mv Masters, A.; Arridge, C. S.; Dougherty, M. K.; Bertucci, Cesar; Billingham, L.; et al.; Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock; American Geophysical Union; Geophysical Research Letters; 35; 2; 12-2008; 1-6
0094-8276
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GL032371
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1029/2007GL032371/abstract
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1846083523726802944
score 13.22299

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