Prospects for Helioseismic Holography in the Deep Solar Interior

Details Prospects for Helioseismic Holography in the Deep Solar Interior Prospects for Helioseismic Holography in the Deep Solar Interior

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21c08l&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP21C-08

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7522 Helioseismology

Scientific paper

Holographic seismic imaging of low-degree acoustic noise opens new prospects for solar interior diagnostics that are most encouraging. Seismic imaging of the near solar interior has given us the discoveries of ``acoustic moats,'' surrounding sunspots, of anomalous emission from ``acoustic glories'' surrounding large active regions, acoustic images of solar flares, and the signatures of apparent acoustic perturbations up to 20~Mm beneath active region photospheres. Low-degree seismic holography is now giving us images of large magnetic regions on the far surface of the Sun, a utility with valuable space-weather forecasting and general synoptic applications. Extensions of the foregoing applications promise insight into the deep solar interior, to the base of the convection zone and into the Sun's nuclear-burning core. Diffraction-limited imaging of low-degree noise over pupils covering most of the near solar hemisphere offer the most discriminating probe of the deep solar interior. Earth-based helioseismic observations coordinated with seismic observations of the far side of the Sun at frequencies in the range 6--7 mHz would allow us to resolve local thermal and Doppler structure in the solar core with a resolution of 75~Mm. Coordinated seismic observations of both near and far sides of the Sun are essential to take advantage of the superior spatial resolution offered by high-frequency waves.

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