Tomographic Imaging of the Sun's Interior

Details Tomographic Imaging of the Sun's Interior Tomographic Imaging of the Sun's Interior

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461l..55k&link_type=abstract

Astrophysical Journal Letters v.461, p.L55

Astronomy and Astrophysics

Astronomy

135

Methods: Data Analysis, Convection, Sun: Activity, Sun: Oscillations, Sun: Sunspots

Scientific paper

A new method is presented of determining the three-dimensional sound-speed structure and flow velocities in the solar convection zone by inversion of the acoustic travel-time data recently obtained by Duvall and coworkers. The initial inversion results reveal large-scale subsurface structures and flows related to the active regions, and are important for understanding the physics of solar activity and large-scale convection. The results provide evidence of a zonal structure below the surface in the low-latitude area of the magnetic activity. Strong converging downflows, up to 1.2 km s-1, and a substantial excess of the sound speed are found beneath growing active regions. In a decaying active region, there is evidence for the lower than average sound speed and for upwelling of plasma.

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