Diagnostic of spectral lines in magnetized solar atmosphere:Formation of the Hβ line in sunspots

作者：HongQi Zhang

摘要：Formation of the Hβλ4861.34Aline is an important topic related to the diagnosis of the basic configuration of magnetic fields in the solar and stellar chromospheres.Specifically,broadening of the Hβλ4861.34Aline occurs due to the magnetic and microelectric fields in the solar atmosphere.The formation of Hβin the model umbral atmosphere is presented based on the assumption of non-local thermodynamic equilibrium.It is found that the model umbral chromosphere is transparent to the Stokes parameters of the Hβline,which implies that the observed signals of magnetic fields at sunspot umbrae via the Hβline originate from the deep solar atmosphere,where lgτc≈-1(about 300 km in the photospheric layer for our calculations).This is in contrast to the observed Stokes signals from non-sunspot areas,which are thought to primarily form in the solar chromosphere.

发文机构：Key Laboratory of Solar Activity

关键词：solarspectrumpolarization-Stokesparametersmagneticfields

分类号： P182.41[天文地球—天文学]