Helioseismology

Aaron Birch

Helioseismology is a collection of methods for using observations of solar oscillations to infer physical conditions in the solar interior. Two of the main results from global-scale helioseismology are the spherically symmetric structure of the solar interior and the latitude and depth dependence of solar differential rotation. Local helioseismology is capable of probing the solar interior in three dimensions and is used to study the meridional flow, the sub-surface structure of sunspots and convection, and network magnetic elements. I will give an overview of the methods of helioseismology, discuss some of the main science results, and describe ongoing work on the local helioseismology of both magnetic and non-magnetic regions on the Sun.