Modelling the Coupling Role of Magnetic Fields in Helioseismology

Authors Organisations
Type Chapter
Original languageEnglish
Title of host publicationHelioseismology, Asteroseismology, and MHD Connections
EditorsLaurent Gizon, Paul Cally, John Leibacher
Place of PublicationNew York
PublisherSpringer Nature
Pages329-340
ISBN (Electronic)978-0-387-89482-9
ISBN (Print)978-0-387-89481-2
DOI
Publication statusPublished - 2009
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Abstract

Helioseismic global modes change in time, in particular on time scales of the solar cycle. These changes show, in fact, strong correlation with the magnetic activity cycle of the Sun, indicating that a most likely cause of the variation of the mode characteristics, such as frequency, is the magnetic field. In the present paper I attempt to find out in what ways and to what degree the magnetic atmosphere of the Sun can influence the f and p modes of helioseismology. Frequency shifts of the order of a microhertz, line widths of the order of a nanohertz, and penetration depths of the order of a megameter are obtained.

Keywords

  • solar physics, Helioseismology, solar interior, Solar atmosphere, solar cycle, Magnetic fields, MHD Modelling