Mapping the magnetic field in the solar corona through magnetoseismology
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https://doi.org/10.1007/s11431-020-1706-9
Mapping the magnetic field in the solar corona through magnetoseismology YANG ZiHao1, TIAN Hui1,2* , TOMCZYK Steven3, MORTON Richard4, BAI XianYong2, SAMANTA Tanmoy5,6 & CHEN YaJie1,7 1 School of Earth and Space Sciences, Peking University, Beijing 100871, China; Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China; 3 High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307, USA; 4 Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK; 5 Department of Physics and Astronomy, George Mason University, Fairfax, VA 22030, USA; 6 Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA; 7 Max Planck Institute for Solar System Research, 37077 G¨ ottingen, Germany 2 Key
Received August 1, 2020; accepted August 3, 2020; published online August 28, 2020
Magnetoseismology, a technique of magnetic field diagnostics based on observations of magnetohydrodynamic (MHD) waves, has been widely used to estimate the field strengths of oscillating structures in the solar corona. However, previously magnetoseismology was mostly applied to occasionally occurring oscillation events, providing an estimate of only the average field strength or one-dimensional distribution of field strength along an oscillating structure. This restriction could be eliminated if we apply magnetoseismology to the pervasive propagating transverse MHD waves discovered with the Coronal Multi-channel Polarimeter (CoMP). Using several CoMP observations of the Fe xiii 1074.7 nm and 1079.8 nm spectral lines, we obtained maps of the plasma density and wave phase speed in the corona, which allow us to map both the strength and direction of the coronal magnetic field in the plane of sky. We also examined distributions of the electron density and magnetic field strength, and compared their variations with height in the quiet Sun and active regions. Such measurements could provide critical information to advance our understanding of the Sun’s magnetism and the magnetic coupling of the whole solar atmosphere. solar corona, solar magnetic field, waves, magnetoseismology Citation:
Yang Z H, Tian H, Tomczyk S, et al. Mapping the magnetic field in the solar corona through magnetoseismology. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-020-1706-9
1 Introduction Originating from the solar interior, the solar magnetic field extends to the solar surface and couples different layers of the solar atmosphere (Figure 1). Because of this, information on the magnetic field of the whole atmosphere is required to study the interplay between the solar plasma and magnetic field. However, routine and reliable measurements of the solar magnetic field have only been achieved at the *Corresponding author (email: [email protected])
photospheric level (e.g., [1, 2]). We still do not have a precise knowledge of the magnetic field
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