Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU

Interplanetary coronal mass ejections (ICMEs) are the manifestation of solar transient eruptions, which can significantly modify the plasma and magnetic conditions in the heliosphere. They are often preceded by a shock, and a magnetic flux rope is detected in situ in a third to half of them. The mai...

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Autor principal: Dasso, Sergio Ricardo
Publicado: 2015
Materias:
ICME shocks
In situ observations
Interplanetary Coronal Mass Ejections
Magnetic Clouds
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699380_v_n_p_Janvier
http://hdl.handle.net/20.500.12110/paper_21699380_v_n_p_Janvier
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_21699380_v_n_p_Janvier
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spelling paper:paper_21699380_v_n_p_Janvier2023-06-08T16:34:51Z Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU Dasso, Sergio Ricardo ICME shocks In situ observations Interplanetary Coronal Mass Ejections Magnetic Clouds Interplanetary coronal mass ejections (ICMEs) are the manifestation of solar transient eruptions, which can significantly modify the plasma and magnetic conditions in the heliosphere. They are often preceded by a shock, and a magnetic flux rope is detected in situ in a third to half of them. The main aim of this study is to obtain the best quantitative shape for the flux rope axis and for the shock surface from in situ data obtained during spacecraft crossings of these structures. We first compare the orientation of the flux rope axes and shock normals obtained from independent data analyses of the same events, observed in situ at 1AU from the Sun. Then we carry out an original statistical analysis of axes/shock normals by deriving the statistical distributions of their orientations. We fit the observed distributions using the distributions derived from several synthetic models describing these shapes. We show that the distributions of axis/shock orientations are very sensitive to their respective shape. One classical model, used to analyze interplanetary imager data, is incompatible with the in situ data. Two other models are introduced, for which the results for axis and shock normals lead to very similar shapes; the fact that the data for MCs and shocks are independent strengthens this result. The model which best fits all the data sets has an ellipsoidal shape with similar aspect ratio values for all the data sets. These derived shapes for the flux rope axis and shock surface have several potential applications. First, these shapes can be used to construct a consistent ICME model. Second, these generic shapes can be used to develop a quantitative model to analyze imager data, as well as constraining the output of numerical simulations of ICMEs. Finally, they will have implications for space weather forecasting, in particular, for forecasting the time arrival of ICMEs at the Earth. © 2015. American Geophysical Union. All Rights Reserved. Fil:Dasso, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699380_v_n_p_Janvier http://hdl.handle.net/20.500.12110/paper_21699380_v_n_p_Janvier
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic ICME shocks
In situ observations
Interplanetary Coronal Mass Ejections
Magnetic Clouds
spellingShingle ICME shocks
In situ observations
Interplanetary Coronal Mass Ejections
Magnetic Clouds
Dasso, Sergio Ricardo
Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU
topic_facet ICME shocks
In situ observations
Interplanetary Coronal Mass Ejections
Magnetic Clouds
description Interplanetary coronal mass ejections (ICMEs) are the manifestation of solar transient eruptions, which can significantly modify the plasma and magnetic conditions in the heliosphere. They are often preceded by a shock, and a magnetic flux rope is detected in situ in a third to half of them. The main aim of this study is to obtain the best quantitative shape for the flux rope axis and for the shock surface from in situ data obtained during spacecraft crossings of these structures. We first compare the orientation of the flux rope axes and shock normals obtained from independent data analyses of the same events, observed in situ at 1AU from the Sun. Then we carry out an original statistical analysis of axes/shock normals by deriving the statistical distributions of their orientations. We fit the observed distributions using the distributions derived from several synthetic models describing these shapes. We show that the distributions of axis/shock orientations are very sensitive to their respective shape. One classical model, used to analyze interplanetary imager data, is incompatible with the in situ data. Two other models are introduced, for which the results for axis and shock normals lead to very similar shapes; the fact that the data for MCs and shocks are independent strengthens this result. The model which best fits all the data sets has an ellipsoidal shape with similar aspect ratio values for all the data sets. These derived shapes for the flux rope axis and shock surface have several potential applications. First, these shapes can be used to construct a consistent ICME model. Second, these generic shapes can be used to develop a quantitative model to analyze imager data, as well as constraining the output of numerical simulations of ICMEs. Finally, they will have implications for space weather forecasting, in particular, for forecasting the time arrival of ICMEs at the Earth. © 2015. American Geophysical Union. All Rights Reserved.
author Dasso, Sergio Ricardo
author_facet Dasso, Sergio Ricardo
author_sort Dasso, Sergio Ricardo
title Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU
title_short Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU
title_full Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU
title_fullStr Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU
title_full_unstemmed Comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 AU
title_sort comparing generic models for interplanetary shocks and magnetic clouds axis configurations at 1 au
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699380_v_n_p_Janvier
http://hdl.handle.net/20.500.12110/paper_21699380_v_n_p_Janvier
work_keys_str_mv AT dassosergioricardo comparinggenericmodelsforinterplanetaryshocksandmagneticcloudsaxisconfigurationsat1au
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