From Polarimetry to Helicity: Studies of Solar Magnetic Fields at the Huairou Solar Observing Station

Abstract

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 of the 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.

19 pages, 19 figures

References in corpus (4)

• Observational Test of Coronal Magnetic Field Models I. Comparison with Potential Field Model
• A Statistical Study on Photospheric Magnetic Nonpotentiality of Active Regions and Its Relationship with Flares during Solar Cycles 22-23
• Photon mean free paths, scattering, and ever-increasing telescope resolution
• Photospheric Magnetic Free Energy Density of Solar Active Regions

Cited by in corpus (2)

• Diagnostic of Spectral Lines in Magnetized Solar Atmosphere: Formation of the H\b{eta} Line in Sunspots
• A Study on Magnetic-sensitivity Wavelength Position of the Working Line Used by the Full-Disk Magnetograph onboard the Advanced Space based Solar Observatory (ASO-S/FMG)