The Significance of Density and Attenuation in the Local Helioseismology

Details The Significance of Density and Attenuation in the Local Helioseismology The Significance of Density and Attenuation in the Local Helioseismology

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...596l.263t&link_type=abstract

The Astrophysical Journal, Volume 596, Issue 2, pp. L263-L266.

Astronomy and Astrophysics

Astronomy

5

Stars: Atmospheres, Sun: Atmosphere, Sun: Helioseismology

Scientific paper

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.

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