Time-Distance Helioseismology of the Deep Interior

T.L. Duvall Jr. (NASA/GSFC)

Points to cover:

• Magnetic field measurements near convection zone bottom

• Deep flow measurements: surprise! : noise correlated from day to day

• Measuring travel times from convection simulations: how large a signal should there be?

Magnetic fields near the base of the convection zone

Rays for deep flow detection

Correlations of maps from one day to the next:

Looking at whether near-surface flows can cause day to day

correlations

• Near-surface flows as shown by the f-mode divergence signal. Overlaid in green is the annulus used for detection of deep flows.

Travel times computed by taking a snapshot of a convection simulation and

integrating over ray paths through the simulation to obtain the times.