Seismic Constraints on Interior Solar Convection

Details Seismic Constraints on Interior Solar Convection Seismic Constraints on Interior Solar Convection

2010-01-25

arxiv.org/abs/1001.4508v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted, ApJ Letters, 5 figures, 10 pages (in this version)

Scientific paper

We constrain the velocity spectral distribution of global-scale solar convective cells at depth using techniques of local helioseismology. We calibrate the sensitivity of helioseismic waves to large-scale convective cells in the interior by analyzing simulations of waves propagating through a velocity snapshot of global solar convection via methods of time-distance helioseismology. Applying identical analysis techniques to observations of the Sun, we are able to bound from above the magnitudes of solar convective cells as a function of spatial convective scale. We find that convection at a depth of $r/R_\odot = 0.95$ with spatial extent $\ell <20$, where $\ell$ is the spherical harmonic degree, comprise weak flow systems, on the order of 15 m/s or less. Convective features deeper than $r/R_\odot = 0.95$ are more difficult to image due to the rapidly decreasing sensitivity of helioseismic waves.

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