Anisotropy in Helioseismic Emission
Abstract
Theoretical research by Nigam, Rast, and Skartlien suggest that seismic emission from the quiet Sun can be significantly characterized in terms of sequences of monopole, dipole and quadrupole transients associated with down-flowing plumes in intergranular lanes. This would result in a significant phase relationship between seismic radiation emitted downward, into the solar interior, and seismic radiation emitted directly upward, into the overlying quiet photosphere. One major result, if the composite monopole and quadrupole transient were generally comparable in power to the dipole component, would be a significant difference in the seismic radiation emitted directly upward from that emitted downward, into the solar interior. I will discuss what the analysis of numerical simulations of seismic emission as a result of turbulence can tell us about this hypothetical anisotropy. Comparisons between high-frequency seismic emission from the quiet Sun and from magnetic regions offer a promising diagnostic role in the investigation of seismic emission anisotropy.
- Publication:
-
American Astronomical Society Meeting Abstracts #210
- Pub Date:
- May 2007
- Bibcode:
- 2007AAS...210.2210L