Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å

We present a complete atomic model for Si I line synthesis. We study how the computed profiles of two blue lines of this atom are influenced by the choice of the atomic parameters and find that, although several cross sections are not known accurately, the line profiles do not depend strongly on the...

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Detalles Bibliográficos
Publicado: 2001
Materias:
Atomic processes
Line: formation
Line: profiles
Stars: chromospheres
Sun: chromosphere
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v552_n2PART1_p877_Cincunegui
http://hdl.handle.net/20.500.12110/paper_0004637X_v552_n2PART1_p877_Cincunegui
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004637X_v552_n2PART1_p877_Cincunegui
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spelling paper:paper_0004637X_v552_n2PART1_p877_Cincunegui2023-06-08T14:28:43Z Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å Atomic processes Line: formation Line: profiles Stars: chromospheres Sun: chromosphere We present a complete atomic model for Si I line synthesis. We study how the computed profiles of two blue lines of this atom are influenced by the choice of the atomic parameters and find that, although several cross sections are not known accurately, the line profiles do not depend strongly on them and are therefore useful as diagnostics of the atmospheric structure. We study which transitions need not be included in the model, in order to reduce as much as possible the computing time. We compare the profiles computed for a standard model of the quiet solar atmosphere with the observations and find very good agreement. We confirm that irradiation by UV lines originating in the transition region above sunspot umbrae or plages strongly enhances the continuum between 1300 and 1700 Å, which is due to Si I bound-free transitions. If line fluxes typical of the impulsive phase of flares are assumed, the line profiles are also affected. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v552_n2PART1_p877_Cincunegui http://hdl.handle.net/20.500.12110/paper_0004637X_v552_n2PART1_p877_Cincunegui
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Atomic processes
Line: formation
Line: profiles
Stars: chromospheres
Sun: chromosphere
spellingShingle Atomic processes
Line: formation
Line: profiles
Stars: chromospheres
Sun: chromosphere
Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å
topic_facet Atomic processes
Line: formation
Line: profiles
Stars: chromospheres
Sun: chromosphere
description We present a complete atomic model for Si I line synthesis. We study how the computed profiles of two blue lines of this atom are influenced by the choice of the atomic parameters and find that, although several cross sections are not known accurately, the line profiles do not depend strongly on them and are therefore useful as diagnostics of the atmospheric structure. We study which transitions need not be included in the model, in order to reduce as much as possible the computing time. We compare the profiles computed for a standard model of the quiet solar atmosphere with the observations and find very good agreement. We confirm that irradiation by UV lines originating in the transition region above sunspot umbrae or plages strongly enhances the continuum between 1300 and 1700 Å, which is due to Si I bound-free transitions. If line fluxes typical of the impulsive phase of flares are assumed, the line profiles are also affected.
title Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å
title_short Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å
title_full Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å
title_fullStr Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å
title_full_unstemmed Blue lines as chromospheric diagnostics: The Si I lines at 3906 and 4103 Å
title_sort blue lines as chromospheric diagnostics: the si i lines at 3906 and 4103 å
publishDate 2001
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v552_n2PART1_p877_Cincunegui
http://hdl.handle.net/20.500.12110/paper_0004637X_v552_n2PART1_p877_Cincunegui
_version_ 1768544938571595776

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