Helioseismology over the solar cycle

TL;DR

This paper reviews 25 years of helioseismology, highlighting global and local methods that reveal the Sun's internal structure, dynamics, and their variations over the solar cycle, contributing to understanding solar magnetism.

Contribution

It provides a concise summary of principal global helioseismology results and recent advances in local helioseismology related to solar cycle variations.

Findings

Frequency variations correlate with the solar cycle

Subsurface flow patterns change over time

Global helioseismology informs solar magnetism understanding

Abstract

Helioseismology has produced unprecedented measurements of the Sun's internal structure and dynamics over the past 25 years. Much of this work has been based on global helioseismology. Now local helioseismology too is showing its great promise. This review summarizes very briefly the principal global results that may be relevant to an understanding of the origins of solar magnetism. Recent results regarding the variation of frequencies over the solar cycle and the temporal variations of subsurface flows are briefly summarized.