EGU21-642, updated on 03 Mar 2021
https://doi.org/10.5194/egusphere-egu21-642
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Mapping the global magnetic field in the solar corona through magnetoseismology

Zihao Yang, Christian Bethge, Hui Tian, Steven Tomczyk, Richard Morton, Giulio Del Zanna, Scott McIntosh, Bidya Binay Karak, Sarah Gibson, Tanmoy Samanta, Jiansen He, Yajie Chen, Linghua Wang, and Xianyong Bai
Zihao Yang et al.
  • Peking University, School of Earth and Space Sciences, China (yangzihao96@pku.edu.cn)

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.

How to cite: Yang, Z., Bethge, C., Tian, H., Tomczyk, S., Morton, R., Del Zanna, G., McIntosh, S., Binay Karak, B., Gibson, S., Samanta, T., He, J., Chen, Y., Wang, L., and Bai, X.: Mapping the global magnetic field in the solar corona through magnetoseismology, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-642, https://doi.org/10.5194/egusphere-egu21-642, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.