English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/13527
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 54 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Sensitivity of spectral lines to temperature, velocity, and magnetic field

AutorCabrera Solana, Daniel; Bellot Rubio, Luis R. ; Toro, José Carlos del
Palabras claveSun: photosphere
Line: profiles
Sun: magnetic fields
Polarization
Fecha de publicaciónago-2005
EditorEDP Sciences
CitaciónAstronomy and Astrophysics 439(2): 687-699 (2005)
ResumenWe present an analytical and numerical study of the sensitivity of weak solar photospheric lines to temperature, velocity, and magnetic fields. Our investigation is based on the concept of response functions (Landi degl'Innocenti & Landi degl'Innocenti 1977; Ruiz Cobo & del Toro Iniesta 1994). Lines commonly used in solar spectropolarimetry, like Fe(I) 630.25 nm in the visible and Fe(I) 1564.85 nm in the infrared, are examined in detail as emerging from reference quiet Sun and sunspot models. We develop a simple phenomenological model capable of describing the response of any given line to these atmospheric parameters. We find that: (a) the sensitivity of the lines to velocity and magnetic fields increases with the sharpness of the intensity and circular polarization profiles; (b) the sensitivity to temperature is determined mainly by the variation of the source function with temperature, which is smaller at longer wavelengths; and (c) lines quoted to be insensitive to temperature, like Fe(I) 1564.85 nm and Fe(I) 557.61 nm, exhibit larger changes in equivalent width than lines presumed to have higher sensitivities to T, such as Fe(I) 630.25 nm. The relations provided by our model are universal and can be used to decide which line is better suited to measuring a given atmospheric parameter. The results of this study are of practical interest for the design of new instruments and for better exploitation of existing ones.
Descripción13 pages, 11 figures, 1 table + Appendix A (3 suppl. tables).
Versión del editorhttp://dx.doi.org/10.1051/0004-6361:20052720
URIhttp://hdl.handle.net/10261/13527
DOI10.1051/0004-6361:20052720
ISSN0004-6361
Aparece en las colecciones: (IAA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Cabrera_et_al_A&A_439_2005.pdf437,88 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.