Multimodal differential emission measure in the solar corona

The Atmospheric Imaging Assembly (AIA) telescope on board the Solar Dynamics Observatory provides coronal extreme ultraviolet imaging over a broader temperature sensitivity range than the previous generations of instruments (Extreme Ultraviolet Imager; EUVI, EIT, and TRACE). Differential emission me...

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Autores principales:	Nuevo, F.A., Vásquez, A.M., Landi, E., Frazin, R.
Formato:	JOUR
Materias:	Sun: corona Sun: UV radiation techniques: miscellaneous
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_0004637X_v811_n2_p_Nuevo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_0004637X_v811_n2_p_Nuevo
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spelling	todo:paper_0004637X_v811_n2_p_Nuevo2023-10-03T14:02:38Z Multimodal differential emission measure in the solar corona Nuevo, F.A. Vásquez, A.M. Landi, E. Frazin, R. Sun: corona Sun: UV radiation techniques: miscellaneous The Atmospheric Imaging Assembly (AIA) telescope on board the Solar Dynamics Observatory provides coronal extreme ultraviolet imaging over a broader temperature sensitivity range than the previous generations of instruments (Extreme Ultraviolet Imager; EUVI, EIT, and TRACE). Differential emission measure tomography (DEMT) of the solar corona based on AIA data is presented here for the first time. The main product of DEMT is the three-dimensional distribution of the local differential emission measure (LDEM). While in previous studies, based on EIT or EUVI data, there were three available EUV bands, the present study is based on the four cooler AIA bands (aimed at studying the quiet sun). The AIA filters allow exploration of new parametric LDEM models. Since DEMT is better suited for lower activity periods, we use data from Carrington Rotation 2099, when the Sun was in its most quiescent state during the AIA mission. Also, we validate the parametric LDEM models by using them to perform a bi-dimensional differential emission measure (DEM) analysis on sets of simultaneous AIA images, and comparing results with those obtained using other methods. Our study reveals a ubiquitous bimodal LDEM distribution in the quiet diffuse corona, characterized by two well-defined average centroid temperatures and We argue that the nanoflare heating scenario is less likely to explain these results, and that alternative mechanisms, such as wave dissipation, appear better supported by our results. ï¿½ 2015. The American Astronomical Society. All rights reserved. Fil:Nuevo, F.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vásquez, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v811_n2_p_Nuevo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Sun: corona Sun: UV radiation techniques: miscellaneous
spellingShingle	Sun: corona Sun: UV radiation techniques: miscellaneous Nuevo, F.A. Vásquez, A.M. Landi, E. Frazin, R. Multimodal differential emission measure in the solar corona
topic_facet	Sun: corona Sun: UV radiation techniques: miscellaneous
description	The Atmospheric Imaging Assembly (AIA) telescope on board the Solar Dynamics Observatory provides coronal extreme ultraviolet imaging over a broader temperature sensitivity range than the previous generations of instruments (Extreme Ultraviolet Imager; EUVI, EIT, and TRACE). Differential emission measure tomography (DEMT) of the solar corona based on AIA data is presented here for the first time. The main product of DEMT is the three-dimensional distribution of the local differential emission measure (LDEM). While in previous studies, based on EIT or EUVI data, there were three available EUV bands, the present study is based on the four cooler AIA bands (aimed at studying the quiet sun). The AIA filters allow exploration of new parametric LDEM models. Since DEMT is better suited for lower activity periods, we use data from Carrington Rotation 2099, when the Sun was in its most quiescent state during the AIA mission. Also, we validate the parametric LDEM models by using them to perform a bi-dimensional differential emission measure (DEM) analysis on sets of simultaneous AIA images, and comparing results with those obtained using other methods. Our study reveals a ubiquitous bimodal LDEM distribution in the quiet diffuse corona, characterized by two well-defined average centroid temperatures and We argue that the nanoflare heating scenario is less likely to explain these results, and that alternative mechanisms, such as wave dissipation, appear better supported by our results. ï¿½ 2015. The American Astronomical Society. All rights reserved.
format	JOUR
author	Nuevo, F.A. Vásquez, A.M. Landi, E. Frazin, R.
author_facet	Nuevo, F.A. Vásquez, A.M. Landi, E. Frazin, R.
author_sort	Nuevo, F.A.
title	Multimodal differential emission measure in the solar corona
title_short	Multimodal differential emission measure in the solar corona
title_full	Multimodal differential emission measure in the solar corona
title_fullStr	Multimodal differential emission measure in the solar corona
title_full_unstemmed	Multimodal differential emission measure in the solar corona
title_sort	multimodal differential emission measure in the solar corona
url	http://hdl.handle.net/20.500.12110/paper_0004637X_v811_n2_p_Nuevo
work_keys_str_mv	AT nuevofa multimodaldifferentialemissionmeasureinthesolarcorona AT vasquezam multimodaldifferentialemissionmeasureinthesolarcorona AT landie multimodaldifferentialemissionmeasureinthesolarcorona AT frazinr multimodaldifferentialemissionmeasureinthesolarcorona
_version_	1807322090045440000

Multimodal differential emission measure in the solar corona

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