Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.5310l&link_type=abstract
American Astronomical Society Meeting 204, #53.10; Bulletin of the American Astronomical Society, Vol. 36, p.757
Astronomy and Astrophysics
Astronomy
Scientific paper
Magnetic fields introduce large phase shifts into acoustic waves passing through the upper 400 km of an active region subphotosphere, impairing the phase coherence of time-distance correlation measurements, including seismic images of the underlying subphotosphere. We call this the "acoustic showerglass" effect. Reliable diagnostics of active region subphotospheres require a careful account of the interaction of acoustic waves with showerglass magnetic fields. A clear understanding of the acoustics of shallow magnetic fields offers the facility for detailed thermal modeling of the showerglass layer. It also opens the possibility of a high-quality magnetic proxy to correct showerglass phase errors, greatly improving our view of the underlying magnetic subphotosphere. The research reported in this poster is supported by grants from the National Aeronautics and Space Administration and the National Science Foundation.
Braun Doug C.
Lindsey Charles
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