TL;DR
This paper reviews methods and recent discoveries in local helioseismology, focusing on imaging the Sun's interior and magnetic fields despite surface magnetic perturbations.
Contribution
It provides a comprehensive overview of analysis techniques and recent findings in local helioseismology related to the magnetic Sun.
Findings
Advances in imaging the Sun's interior despite magnetic perturbations
Recent discoveries of subsurface flows and magnetic structures
Progress in interpreting helioseismic data in active regions
Abstract
The goal of local helioseismology is to elicit three-dimensional information about the sub-surface (or far-side) structure and dynamics of the Sun from observations of the helioseismic wave field at the surface. The physical quantities of interest include flows, sound-speed deviations and magnetic fields. However, strong surface magnetic fields induce large perturbations to the waves making inversions difficult to interpret. The purpose of this paper is to outline the methods of analysis used in local helioseismology, review discoveries associated with the magnetic Sun made using local helioseismology from the past three years, and highlight the efforts towards imaging the interior in the presence of strong magnetic fields.
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