Statistics – Computation
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp13a..06l&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP13A-06
Statistics
Computation
7522 Helioseismology, 7529 Photosphere
Scientific paper
A major issue in the physics of seismic emission in the quiet Sun is the degree to which the emission from any particular location is episodic. Given our present understanding, this question is equivalent to that of how localized the sources of emission are at any particular moment. A variety of statistical tools are available to address this issue. For example, if seismic emission can be characterized in terms of relatively infrequent episodes sparsely distributed, then the distribution in amplitude of the source terms over space and time should be non-Gaussian. If the episodes of emission are densely disseminenated in space and time such that many phase-independent episodes would be expected in a space-time resolution element,then the distribution in amplitude approaches Gaussian statistics, and the distribution in power becomes exponential. Computational seismic holography focused at the solar surface from a subjacent vantage makes it possible to image acoustic sources and do statistics on the seismic source term. Earlier work by Donea, Lindsey and Braun, based on holographic imaging of acoustic sources, failed to detect a departure of source amplitudes from Gaussian statistics. This suggests that seismic sources are relatively dense on a spatial scale of 3~Mm and a temporal scale of 10~min. What this means in terms of the physics of acoustic excitation requires modeling. We will describe beginning efforts to model seismic emission in a standard model of the solar subphotosphere in terms of randomly distributed dipoles located close to the solar surface. A significant departute of the source amplitude distribution from Gaussian statistics is of fundamental importance to the utility of local helioseismic diagnostics to seismic emission in the quiet Sun.
Birch Aaron C.
Donea Alina
Lindsey Charles A.
Rast Mark P.
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