In this paper, we briefly introduce the basic questions in the measurements of solar magnetic fields and the possible error sources due to the approximation of the theory of radiation transfer of spectral lines in the...In this paper, we briefly introduce the basic questions in the measurements of solar magnetic fields and the possible error sources due to the approximation of the theory of radiation transfer of spectral lines in the solar atmosphere. We introduce some basic research progress in magnetic field measurement at Huairou Solar Observing Station of National Astronomical Observatories,Chinese Academy of Sciences, especially concerning the non-potentiality in solar active regions, such as the magnetic shear,current and helicity. We also discuss some basic questions for the measurements of the magnetic fields and corresponding challenges for the future studies.展开更多
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 o...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.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11673033,11911530089,11427803,and 11427901)the Huairou Solar Observing Station,Chinese Academy of Sciences
文摘In this paper, we briefly introduce the basic questions in the measurements of solar magnetic fields and the possible error sources due to the approximation of the theory of radiation transfer of spectral lines in the solar atmosphere. We introduce some basic research progress in magnetic field measurement at Huairou Solar Observing Station of National Astronomical Observatories,Chinese Academy of Sciences, especially concerning the non-potentiality in solar active regions, such as the magnetic shear,current and helicity. We also discuss some basic questions for the measurements of the magnetic fields and corresponding challenges for the future studies.
基金supported by the National Natural Science Foundation of China(Grant Nos.11673033,11427803,and 11427901)。
文摘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.
