The Significance of Density and Attenuation in the Local Helioseismology
Abstract
We present results from numerical simulations in order to demonstrate the significance of density and attenuation in helioseismic data modeling and in the interpretation of reconstructed solar models. Attenuation beneath active regions causes significant dispersion as well as temporal shifts of the helioseismic signals. These effects can be considerably more significant than those caused by sound-speed anomalies. On the basis of the differential changes in the waveform of the signals as a function of density, we propose the modeling of density for the estimation of the relative contribution from buoyancy and magnetic fields toward the origin of the fluid flows in the solar interior.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 2003
- DOI:
- 10.1086/379341
- Bibcode:
- 2003ApJ...596L.263T
- Keywords:
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- Stars: Atmospheres;
- Sun: Atmosphere;
- Sun: Helioseismology