Magnetic Field Gradient Across the Flank Magnetopause

Magnetic pressure inside the magnetopause is usually balanced with a sum of thermal plasma and magnetic pressures on the magnetosheath side. However, observations reveal that the magnetosheath magnetic field can be frequently larger than that in the magnetosphere (inverse magnetic field gradient acr...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Zdeněk Němeček, Kostiantyn Grygorov, Jana Šafránková, Jiří Šimůnek, Gilbert Pi
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	magnetosphere magnetopause magnetosheath pressure balance magnetic field gradient inverse gradient Astronomy QB1-991 Geophysics. Cosmic physics QC801-809
Acceso en línea:	https://doaj.org/article/869ac2e96e914b8bb681ed1ce788804d
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:869ac2e96e914b8bb681ed1ce788804d
record_format	dspace
spelling	oai:doaj.org-article:869ac2e96e914b8bb681ed1ce788804d2021-11-17T06:26:12ZMagnetic Field Gradient Across the Flank Magnetopause2296-987X10.3389/fspas.2021.778234https://doaj.org/article/869ac2e96e914b8bb681ed1ce788804d2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fspas.2021.778234/fullhttps://doaj.org/toc/2296-987XMagnetic pressure inside the magnetopause is usually balanced with a sum of thermal plasma and magnetic pressures on the magnetosheath side. However, observations reveal that the magnetosheath magnetic field can be frequently larger than that in the magnetosphere (inverse magnetic field gradient across the magnetopause), and thus, the enhanced pressure from the magnetosheath side seems to be uncompensated. Such events are rare in the subsolar region, but their occurrence rate increases toward flanks. The analysis, based on statistical processing of about 35,000 THEMIS magnetopause crossings collected in the course of the years 2007–2017, shows that these events are more frequently observed under enhanced geomagnetic activity that is connected with a strong southward IMF. Case studies reveal that such a state of the magnetopause boundary layers can persist for several hours. This study discusses conditions and mechanisms keeping the pressure balance across the magnetopause under these conditions.Zdeněk NěmečekKostiantyn GrygorovJana ŠafránkováJiří ŠimůnekGilbert PiFrontiers Media S.A.articlemagnetospheremagnetopausemagnetosheathpressure balancemagnetic field gradientinverse gradientAstronomyQB1-991Geophysics. Cosmic physicsQC801-809ENFrontiers in Astronomy and Space Sciences, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	magnetosphere magnetopause magnetosheath pressure balance magnetic field gradient inverse gradient Astronomy QB1-991 Geophysics. Cosmic physics QC801-809
spellingShingle	magnetosphere magnetopause magnetosheath pressure balance magnetic field gradient inverse gradient Astronomy QB1-991 Geophysics. Cosmic physics QC801-809 Zdeněk Němeček Kostiantyn Grygorov Jana Šafránková Jiří Šimůnek Gilbert Pi Magnetic Field Gradient Across the Flank Magnetopause
description	Magnetic pressure inside the magnetopause is usually balanced with a sum of thermal plasma and magnetic pressures on the magnetosheath side. However, observations reveal that the magnetosheath magnetic field can be frequently larger than that in the magnetosphere (inverse magnetic field gradient across the magnetopause), and thus, the enhanced pressure from the magnetosheath side seems to be uncompensated. Such events are rare in the subsolar region, but their occurrence rate increases toward flanks. The analysis, based on statistical processing of about 35,000 THEMIS magnetopause crossings collected in the course of the years 2007–2017, shows that these events are more frequently observed under enhanced geomagnetic activity that is connected with a strong southward IMF. Case studies reveal that such a state of the magnetopause boundary layers can persist for several hours. This study discusses conditions and mechanisms keeping the pressure balance across the magnetopause under these conditions.
format	article
author	Zdeněk Němeček Kostiantyn Grygorov Jana Šafránková Jiří Šimůnek Gilbert Pi
author_facet	Zdeněk Němeček Kostiantyn Grygorov Jana Šafránková Jiří Šimůnek Gilbert Pi
author_sort	Zdeněk Němeček
title	Magnetic Field Gradient Across the Flank Magnetopause
title_short	Magnetic Field Gradient Across the Flank Magnetopause
title_full	Magnetic Field Gradient Across the Flank Magnetopause
title_fullStr	Magnetic Field Gradient Across the Flank Magnetopause
title_full_unstemmed	Magnetic Field Gradient Across the Flank Magnetopause
title_sort	magnetic field gradient across the flank magnetopause
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/869ac2e96e914b8bb681ed1ce788804d
work_keys_str_mv	AT zdeneknemecek magneticfieldgradientacrosstheflankmagnetopause AT kostiantyngrygorov magneticfieldgradientacrosstheflankmagnetopause AT janasafrankova magneticfieldgradientacrosstheflankmagnetopause AT jirisimunek magneticfieldgradientacrosstheflankmagnetopause AT gilbertpi magneticfieldgradientacrosstheflankmagnetopause
_version_	1718425869908705280

Magnetic Field Gradient Across the Flank Magnetopause

Ejemplares similares