Helium line formation in a solar active region

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An observing campaign coordinated between ground based and SOHO instruments has been planned to obtain simultaneous spectroheliograms of the same area in several spectral lines. The chromospheric lines Ca II K, Hα and Na I D, as well as the He I 10830, 5876, 584 and He II 304 Å lines, have been obse...

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Detalles Bibliográficos
Autor principal: Mauas, P.J.D
Otros Autores: Andretta, V., Falchi, A., Falciani, R., Teriaca, L., Cauzzi, G., Favata F., Hussain G.A.J, Battrick B.
Formato: Acta de conferencia Capítulo de libro
Lenguaje:Inglés
Publicado: 2005
Acceso en línea:Registro en Scopus
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Registro en la Biblioteca Digital
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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030 |a ESPUD 
100 1 |a Mauas, P.J.D. 
245 1 0 |a Helium line formation in a solar active region 
260 |c 2005 
270 1 0 |m Mauas, P.J.D.; Instituto de Astronomía y Física del Espacio, CC. 67, Suc. 28, 1428 Buenos Aires, Argentina 
506 |2 openaire  |e Política editorial 
504 |a Andretta, V., Jones, H.P., (1997) ApJ, 489, p. 375 
504 |a Avrett, E.H., Loeser, R., (2004) IAU Symp., 210. , in press 
504 |a Barraclough, B.L., Gosling, J.T., McComas, D.J., Goldstein, B.E., (1995) Solar Wind, 8, p. 73 
504 |a Boothroyd, A.I., Sackmann, I.-J., (2003) ApJ, 583, p. 1004 
504 |a Bochsler, P., (1998) Space Sci. Rev., 85, p. 291 
504 |a Falchi, A., Mauas, P.J.D., (1998) A&A, 336, p. 281 
504 |a Feldman, U., (1998) Space Sci. Rev., 85, p. 227 
504 |a Fontenla, J.M., Avrett, E.H., Loeser, R., (1993) ApJ, 406, p. 319 
504 |a Gabriel, A.H., (1995) Adv. in Space Research, 15, p. 63 
504 |a Geiss, J., (1982) Space Sci. Rev., 33, p. 201 
504 |a Laming, J.M., Feldman, U., (2003) ApJ, 591, p. 1257 
504 |a Lie-Svendsen, O., Hansteen, V.H., Leer, E., (2003) ApJ, 596, p. 621 
504 |a Mauas, P.J.D., Avrett, E.H., Loeser, R., (1988) ApJ, 330, p. 1008 
504 |a Mauas, P.J.D., Falchi, A., Pasquini, L., Pallavicini, R., (1997) A&A, 326, p. 249 
504 |a Raymond, J.C., (1997) Sol. Phys., 175, p. 645 
504 |a Teriaca, L., Falchi, A., Cauzzi, G., Falciani, R., Smaldone, L.A., Andretta, V., (2003) ApJ, 558, p. 596 
504 |a Young, P.R., Del Zanna, G., Landi, E., Dere, K.P., Mason, H.E., Landini, M., (2003) ApJS, 144, p. 135 
520 3 |a An observing campaign coordinated between ground based and SOHO instruments has been planned to obtain simultaneous spectroheliograms of the same area in several spectral lines. The chromospheric lines Ca II K, Hα and Na I D, as well as the He I 10830, 5876, 584 and He II 304 Å lines, have been observed. These observations allow us to build semi-empirical models of the chromosphere and low transition region of an active region, taking into account the photoionizing photons impinging on it. We obtained a model that matches very well all the observed line profiles, using the standard value of the He abundance ([He]=0.1). We studied the influence of the coronal radiation on the computed helium lines and found that, even in an active region, the incident coronal radiation has a limited effect on the UV He lines, while it results of fundamental importance for the D3 and 10830 lines. Finally, we built two more models assuming values of the He abundance [He]=0.07 and 1.5, only in the region where the temperatures are larger than 10000 K and found that the observations can still be well reproduced in both cases. This implies that, to choose between different values of [He], it is necessary to constrain the transition region with different observables, independent of the He lines.  |l eng 
593 |a Instituto de Astronomía y Física del Espacio, CC. 67, Suc. 28, 1428 Buenos Aires, Argentina 
593 |a INAF, Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy 
593 |a INAF, Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy 
593 |a Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo Fermi 5, 50125 Firenze, Italy 
593 |a Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany 
690 1 0 |a SUN: ABUNDANCES 
690 1 0 |a SUN: ACTIVITY 
690 1 0 |a SUN: HELIUM 
690 1 0 |a INFRARED RADIATION 
690 1 0 |a PHOTOIONIZATION 
690 1 0 |a PHOTONS 
690 1 0 |a PLASMAS 
690 1 0 |a SCANNING ELECTRON MICROSCOPY 
690 1 0 |a SOLAR ENERGY 
690 1 0 |a SUN 
690 1 0 |a ULTRAVIOLET RADIATION 
690 1 0 |a SPECTROHELIOGRAMS 
690 1 0 |a SUN: ABUNDANCES 
690 1 0 |a SUN: ACTIVITY 
690 1 0 |a SUN: HELIUM 
690 1 0 |a HELIUM 
700 1 |a Andretta, V. 
700 1 |a Falchi, A. 
700 1 |a Falciani, R. 
700 1 |a Teriaca, L. 
700 1 |a Cauzzi, G. 
700 1 |a Favata F. 
700 1 |a Hussain G.A.J. 
700 1 |a Battrick B. 
711 2 |c Hamburg  |d 5 July 2004 through 9 July 2004  |g Código de la conferencia: 65457 
773 0 |d 2005  |h pp. 811-814  |k n. 560 II  |p Eur Space Agency Spec Publ ESA SP  |n European Space Agency, (Special Publication) ESA SP  |x 03796566  |t 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun 
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856 4 0 |u https://hdl.handle.net/20.500.12110/paper_03796566_v_n560II_p811_Mauas  |y Handle 
856 4 0 |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n560II_p811_Mauas  |y Registro en la Biblioteca Digital 
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999 |c 82989 

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