Prospects for Helioseismic Holography in the Deep Solar Interior
Abstract
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.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2001
- Bibcode:
- 2001AGUSM..SP21C08L
- Keywords:
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- 7522 Helioseismology