Heliotomography of the outer layers of the Sun

Details Heliotomography of the outer layers of the Sun Heliotomography of the outer layers of the Sun

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..701k&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Computer Science

Sound

7

Heliotomography, Time-Distance Helioseismology, Solar Interior, Active Regions, Sunspots

Scientific paper

Heliotomography offers important diagnostics of the solar interior by providing three-dimensional maps of the sound speed and flows in the upper convection zone. These diagnostics are based on inversion of travel times of acoustic waves which propagate between different points on the solar surface through the interior. The most significant variations in the thermodynamic structure found by this method are associated with sunspots and complexes of solar activity. The inversion results provide evidence for areas of higher sound speed beneath sunspot regions located at depths of 4 - 20 Mm, which may be due to accumulated heat or magnetic field concentrations. The results reveal structures and flows associated with active regions and sunspots at various stages of their evolution, and provide important constraints for theories of solar dynamics and activity.

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