Acoustic Power and Travel Time Signatures of Emerging Subsurface Structures

Details Acoustic Power and Travel Time Signatures of Emerging Subsurface Structures Acoustic Power and Travel Time Signatures of Emerging Subsurface Structures

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0709k&link_type=abstract

American Astronomical Society, SPD meeting #40, #7.09; Bulletin of the American Astronomical Society, Vol. 41, p.814

Astronomy and Astrophysics

Astronomy

Scientific paper

It is generally believed that larger magnetic structures rising from below the surface by self induction and convection can lead to the formation of active regions and sunspots on the solar surface. For space weather forecasting, one would like to detect such subsurface structures before they become visible on the surface. In this work we investigate signatures of such emerging subsurface structures.
Numerical simulations of solar acoustic wave propagation performed by us show that under suitable conditions subsurface structures that modify the propagation speed of the waves can result, depending on the sign of the perturbation, in a reduction or enhancement of the acoustic power observed at the photosphere above them. Results from our simulations and observational evidence is presented.
In principle, measurements of travel times may also be able to detect signatures of such emerging subsurface structures. The limiting factor is here the short measurement time required, since active region usually emerge rather quickly, and the associated noise level. We will present results from analyzing artificial data obtained from our simulations as well as MDI observations.

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