Improving the Ni I atomic model for solar and stellar atmospheric models

MARIELA VIEYTES; JUAN FONTENLA

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2013 vol. 769 p. 103 - 112

0004-637X

Neutral nickel (Ni I) is abundant in the solar atmosphere and is one of the important elements that contribute to the emission and absorption of radiation in the spectral range between 1900 and 3900 A. Previously, the Solar Radiation Physical Modeling (SRPM) models of the solar atmosphere considere d only few levels of this species. Here we improve the Ni I atomic model by taking into account 61 levels and 490 spectral lines. We compute the population s of these levels in full NLTE using the SRPM code and compare the resulting emer ging spectrum with observations. The present atomic model improves significantly the calculation of the solar spectral irradiance at near-UV wavelengths that are important for Earth atmo- spheric studies, and particularly for ozone chemistry.