Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses

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We study interplanetary coronal mass ejections (ICMEs) measured by probes at different heliocentric distances (0.3–1 AU) to investigate the propagation of ICMEs in the inner heliosphere and determine how the generic features of ICMEs change with heliospheric distance. Using data from the MErcury Sur...

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Autores principales: Janvier, M., Winslow, R.M., Good, S., Bonhomme, E., Démoulin, P., Dasso, S., Möstl, C., Lugaz, N., Amerstorfer, T., Soubrié, E., Boakes, P.D.
Formato: JOUR
Materias:
coronal mass ejections
data analysis
heliospheric physics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_21699380_v124_n2_p812_Janvier
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_21699380_v124_n2_p812_Janvier
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spelling todo:paper_21699380_v124_n2_p812_Janvier2023-10-03T16:40:01Z Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses Janvier, M. Winslow, R.M. Good, S. Bonhomme, E. Démoulin, P. Dasso, S. Möstl, C. Lugaz, N. Amerstorfer, T. Soubrié, E. Boakes, P.D. coronal mass ejections data analysis heliospheric physics We study interplanetary coronal mass ejections (ICMEs) measured by probes at different heliocentric distances (0.3–1 AU) to investigate the propagation of ICMEs in the inner heliosphere and determine how the generic features of ICMEs change with heliospheric distance. Using data from the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER), Venus Express and ACE spacecraft, we analyze with the superposed epoch technique the profiles of ICME substructures, namely, the sheath and the magnetic ejecta. We determine that the median magnetic field magnitude in the sheath correlates well with ICME speeds at 1 AU, and we use this proxy to order the ICMEs at all spacecraft. We then investigate the typical ICME profiles for three categories equivalent to slow, intermediate, and fast ICMEs. Contrary to fast ICMEs, slow ICMEs have a weaker solar wind field at the front and a more symmetric magnetic field profile. We find the asymmetry to be less pronounced at Earth than at Mercury, indicating a relaxation taking place as ICMEs propagate. We also find that the magnetic field intensities in the wake region of the ICMEs do not go back to the pre-ICME solar wind intensities, suggesting that the effects of ICMEs on the ambient solar wind last longer than the duration of the transient event. Such results provide an indication of physical processes that need to be reproduced by numerical simulations of ICME propagation. The samples studied here will be greatly improved by future missions dedicated to the exploration of the inner heliosphere, such as Parker Solar Probe and Solar Orbiter. ©2019. American Geophysical Union. All Rights Reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21699380_v124_n2_p812_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 coronal mass ejections
data analysis
heliospheric physics
spellingShingle coronal mass ejections
data analysis
heliospheric physics
Janvier, M.
Winslow, R.M.
Good, S.
Bonhomme, E.
Démoulin, P.
Dasso, S.
Möstl, C.
Lugaz, N.
Amerstorfer, T.
Soubrié, E.
Boakes, P.D.
Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses
topic_facet coronal mass ejections
data analysis
heliospheric physics
description We study interplanetary coronal mass ejections (ICMEs) measured by probes at different heliocentric distances (0.3–1 AU) to investigate the propagation of ICMEs in the inner heliosphere and determine how the generic features of ICMEs change with heliospheric distance. Using data from the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER), Venus Express and ACE spacecraft, we analyze with the superposed epoch technique the profiles of ICME substructures, namely, the sheath and the magnetic ejecta. We determine that the median magnetic field magnitude in the sheath correlates well with ICME speeds at 1 AU, and we use this proxy to order the ICMEs at all spacecraft. We then investigate the typical ICME profiles for three categories equivalent to slow, intermediate, and fast ICMEs. Contrary to fast ICMEs, slow ICMEs have a weaker solar wind field at the front and a more symmetric magnetic field profile. We find the asymmetry to be less pronounced at Earth than at Mercury, indicating a relaxation taking place as ICMEs propagate. We also find that the magnetic field intensities in the wake region of the ICMEs do not go back to the pre-ICME solar wind intensities, suggesting that the effects of ICMEs on the ambient solar wind last longer than the duration of the transient event. Such results provide an indication of physical processes that need to be reproduced by numerical simulations of ICME propagation. The samples studied here will be greatly improved by future missions dedicated to the exploration of the inner heliosphere, such as Parker Solar Probe and Solar Orbiter. ©2019. American Geophysical Union. All Rights Reserved.
format JOUR
author Janvier, M.
Winslow, R.M.
Good, S.
Bonhomme, E.
Démoulin, P.
Dasso, S.
Möstl, C.
Lugaz, N.
Amerstorfer, T.
Soubrié, E.
Boakes, P.D.
author_facet Janvier, M.
Winslow, R.M.
Good, S.
Bonhomme, E.
Démoulin, P.
Dasso, S.
Möstl, C.
Lugaz, N.
Amerstorfer, T.
Soubrié, E.
Boakes, P.D.
author_sort Janvier, M.
title Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses
title_short Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses
title_full Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses
title_fullStr Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses
title_full_unstemmed Generic Magnetic Field Intensity Profiles of Interplanetary Coronal Mass Ejections at Mercury, Venus, and Earth From Superposed Epoch Analyses
title_sort generic magnetic field intensity profiles of interplanetary coronal mass ejections at mercury, venus, and earth from superposed epoch analyses
url http://hdl.handle.net/20.500.12110/paper_21699380_v124_n2_p812_Janvier
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