3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities

Three-dimensional (3D) tomographic analysis of extreme ultraviolet (EUV) images is used to place empirical constraints on the corona's temperature and density structure. The input data are images taken by the EUVI instrument on STEREO A and B spacecraft for Carrington Rotation 2069 (16 April to...

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Autores principales: Vásquez, A.M., Frazin, R.A., Kamalabadi, F.
Formato: JOUR
Materias:
Coronal cavities
Differential emission measure
Electron density
EUV imaging
Filaments
Solar corona
STEREO mission
Tomography
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00380938_v256_n1-2_p73_Vasquez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00380938_v256_n1-2_p73_Vasquez
record_format dspace
spelling todo:paper_00380938_v256_n1-2_p73_Vasquez2023-10-03T14:48:41Z 3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities Vásquez, A.M. Frazin, R.A. Kamalabadi, F. Coronal cavities Differential emission measure Electron density EUV imaging Filaments Solar corona STEREO mission Tomography Three-dimensional (3D) tomographic analysis of extreme ultraviolet (EUV) images is used to place empirical constraints on the corona's temperature and density structure. The input data are images taken by the EUVI instrument on STEREO A and B spacecraft for Carrington Rotation 2069 (16 April to 13 May 2008). While the reconstructions are global, we demonstrate the capabilities of this method by examining specific structures in detail. Of particular importance are the results for coronal cavities and the surrounding helmet streamers, which our method allows to be analyzed without projection effects for the first time. During this rotation, both the northern and southern hemispheres exhibited stable polar crown filaments with overlying EUV cavities. These filaments and cavities were too low-lying to be well observed in white-light coronagraphs. Furthermore, due to projection effects, these cavities were not clearly discernible above the limb in EUV images, thus tomography offers the only option to study their plasma properties quantitatively. It is shown that, when compared to the surrounding helmet material, these cavities have lower densities (about 30%, on average) and broader local differential emission measures that are shifted to higher temperatures than the surrounding streamer plasma. © 2009 Springer Science+Business Media B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00380938_v256_n1-2_p73_Vasquez
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 cavities
Differential emission measure
Electron density
EUV imaging
Filaments
Solar corona
STEREO mission
Tomography
spellingShingle Coronal cavities
Differential emission measure
Electron density
EUV imaging
Filaments
Solar corona
STEREO mission
Tomography
Vásquez, A.M.
Frazin, R.A.
Kamalabadi, F.
3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities
topic_facet Coronal cavities
Differential emission measure
Electron density
EUV imaging
Filaments
Solar corona
STEREO mission
Tomography
description Three-dimensional (3D) tomographic analysis of extreme ultraviolet (EUV) images is used to place empirical constraints on the corona's temperature and density structure. The input data are images taken by the EUVI instrument on STEREO A and B spacecraft for Carrington Rotation 2069 (16 April to 13 May 2008). While the reconstructions are global, we demonstrate the capabilities of this method by examining specific structures in detail. Of particular importance are the results for coronal cavities and the surrounding helmet streamers, which our method allows to be analyzed without projection effects for the first time. During this rotation, both the northern and southern hemispheres exhibited stable polar crown filaments with overlying EUV cavities. These filaments and cavities were too low-lying to be well observed in white-light coronagraphs. Furthermore, due to projection effects, these cavities were not clearly discernible above the limb in EUV images, thus tomography offers the only option to study their plasma properties quantitatively. It is shown that, when compared to the surrounding helmet material, these cavities have lower densities (about 30%, on average) and broader local differential emission measures that are shifted to higher temperatures than the surrounding streamer plasma. © 2009 Springer Science+Business Media B.V.
format JOUR
author Vásquez, A.M.
Frazin, R.A.
Kamalabadi, F.
author_facet Vásquez, A.M.
Frazin, R.A.
Kamalabadi, F.
author_sort Vásquez, A.M.
title 3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities
title_short 3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities
title_full 3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities
title_fullStr 3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities
title_full_unstemmed 3D temperatures and densities of the solar corona via multi-spacecraft EUV tomography: Analysis of prominence cavities
title_sort 3d temperatures and densities of the solar corona via multi-spacecraft euv tomography: analysis of prominence cavities
url http://hdl.handle.net/20.500.12110/paper_00380938_v256_n1-2_p73_Vasquez
work_keys_str_mv AT vasquezam 3dtemperaturesanddensitiesofthesolarcoronaviamultispacecrafteuvtomographyanalysisofprominencecavities
AT frazinra 3dtemperaturesanddensitiesofthesolarcoronaviamultispacecrafteuvtomographyanalysisofprominencecavities
AT kamalabadif 3dtemperaturesanddensitiesofthesolarcoronaviamultispacecrafteuvtomographyanalysisofprominencecavities
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