Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs

The intensity of the southward component of the magnetic field (Bs) carried by Interplanetary Coronal Mass Ejections (ICMEs) is one of the most critical parameters in causing extreme space weather events, such as intense geomagnetic storms. In this work, we investigate three typical ICME events with...

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Autores principales:	Chenglong Shen, Yutian Chi, Mengjiao Xu, Yuming Wang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	interplanetary coronal mass ejection shock-ICME interaction multiple ICMEs intense Bs interplanetary magnetic field Physics QC1-999
Acceso en línea:	https://doaj.org/article/4a747e176b454d1a8ea4aa8c977c1c3c
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spelling	oai:doaj.org-article:4a747e176b454d1a8ea4aa8c977c1c3c2021-12-01T08:06:35ZOrigin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs2296-424X10.3389/fphy.2021.762488https://doaj.org/article/4a747e176b454d1a8ea4aa8c977c1c3c2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fphy.2021.762488/fullhttps://doaj.org/toc/2296-424XThe intensity of the southward component of the magnetic field (Bs) carried by Interplanetary Coronal Mass Ejections (ICMEs) is one of the most critical parameters in causing extreme space weather events, such as intense geomagnetic storms. In this work, we investigate three typical ICME events with extremely intense Bs in detail and present a statistical analysis of the origins of intense Bs in different types of ICMEs based on the ICME catalogue from 1995 to 2020. According to the in-situ characteristics, the ICME events with extremely high Bs are classified into three types: isolated ICMEs, multiple ICMEs, and shock-ICME interaction events with shocks inside ICMEs or shocks passing through ICMEs. By analyzing all ICME events with Bs ≥ 10nT and Bs ≥ 20nT, we find that 39.6% of Bs,mean ≥ 10nT events and 50% of Bs,mean ≥ 20nT events are associated with shock-ICME events. Approximately 35.7% of shock-ICME events have Bs,mean ≥ 10nT, which is much higher than the other two types (isoloted ICMEs: 7.2% and multiple ICMEs: 12.1%). Those results confirm that the ICMEs interaction events are more likely to carry extreme intense Bs and cause intense geomagntic storms. Only based on the in-situ observations at Earth, some interaction ICME events, such as shock-ICME interaction events with shocks passing through the preceding ICME or ICME cannibalism, could be classified as isolated ICME events. This may lead to an overestimate of the probability of ICME carrying extremely intense Bs. To further investigate such events, direct and multi-point observations of the CME propagation in the inner heliosphere from the Solar Ring Mission could be crucial in the future.Chenglong ShenChenglong ShenYutian ChiMengjiao XuYuming WangYuming WangFrontiers Media S.A.articleinterplanetary coronal mass ejectionshock-ICME interactionmultiple ICMEsintense Bsinterplanetary magnetic fieldPhysicsQC1-999ENFrontiers in Physics, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	interplanetary coronal mass ejection shock-ICME interaction multiple ICMEs intense Bs interplanetary magnetic field Physics QC1-999
spellingShingle	interplanetary coronal mass ejection shock-ICME interaction multiple ICMEs intense Bs interplanetary magnetic field Physics QC1-999 Chenglong Shen Chenglong Shen Yutian Chi Mengjiao Xu Yuming Wang Yuming Wang Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs
description	The intensity of the southward component of the magnetic field (Bs) carried by Interplanetary Coronal Mass Ejections (ICMEs) is one of the most critical parameters in causing extreme space weather events, such as intense geomagnetic storms. In this work, we investigate three typical ICME events with extremely intense Bs in detail and present a statistical analysis of the origins of intense Bs in different types of ICMEs based on the ICME catalogue from 1995 to 2020. According to the in-situ characteristics, the ICME events with extremely high Bs are classified into three types: isolated ICMEs, multiple ICMEs, and shock-ICME interaction events with shocks inside ICMEs or shocks passing through ICMEs. By analyzing all ICME events with Bs ≥ 10nT and Bs ≥ 20nT, we find that 39.6% of Bs,mean ≥ 10nT events and 50% of Bs,mean ≥ 20nT events are associated with shock-ICME events. Approximately 35.7% of shock-ICME events have Bs,mean ≥ 10nT, which is much higher than the other two types (isoloted ICMEs: 7.2% and multiple ICMEs: 12.1%). Those results confirm that the ICMEs interaction events are more likely to carry extreme intense Bs and cause intense geomagntic storms. Only based on the in-situ observations at Earth, some interaction ICME events, such as shock-ICME interaction events with shocks passing through the preceding ICME or ICME cannibalism, could be classified as isolated ICME events. This may lead to an overestimate of the probability of ICME carrying extremely intense Bs. To further investigate such events, direct and multi-point observations of the CME propagation in the inner heliosphere from the Solar Ring Mission could be crucial in the future.
format	article
author	Chenglong Shen Chenglong Shen Yutian Chi Mengjiao Xu Yuming Wang Yuming Wang
author_facet	Chenglong Shen Chenglong Shen Yutian Chi Mengjiao Xu Yuming Wang Yuming Wang
author_sort	Chenglong Shen
title	Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs
title_short	Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs
title_full	Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs
title_fullStr	Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs
title_full_unstemmed	Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs
title_sort	origin of extremely intense southward component of magnetic field (bs) in icmes
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/4a747e176b454d1a8ea4aa8c977c1c3c
work_keys_str_mv	AT chenglongshen originofextremelyintensesouthwardcomponentofmagneticfieldbsinicmes AT chenglongshen originofextremelyintensesouthwardcomponentofmagneticfieldbsinicmes AT yutianchi originofextremelyintensesouthwardcomponentofmagneticfieldbsinicmes AT mengjiaoxu originofextremelyintensesouthwardcomponentofmagneticfieldbsinicmes AT yumingwang originofextremelyintensesouthwardcomponentofmagneticfieldbsinicmes AT yumingwang originofextremelyintensesouthwardcomponentofmagneticfieldbsinicmes
_version_	1718405409713160192

Origin of Extremely Intense Southward Component of Magnetic Field (Bs) in ICMEs

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