Progress in Helioseismic Holography

Details Progress in Helioseismic Holography Progress in Helioseismic Holography

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21c07b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP21C-07 INVITED

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7522 Helioseismology, 7524 Magnetic Fields, 7544 Stellar Interiors And Dynamo Theory

Scientific paper

Local Helioseismology uses acoustic waves to probe small-scale structures in the solar interior down to a spatial resolution imposed by wave diffraction. Although its practitioners, including this author, may sometimes employ measurements of the acoustic wave field made over a local area of the Sun's surface to examine its shallow layers, local helioseismology generally has a much broader utility. For example, some applications of helioseismic holography (and other local diagnostics) require global acoustic modes, observed over large portions of the surface, to produce diffraction-limited images of the far side or deep interior of the Sun. In this review, I will summarize recent progress achieved in seismic holography in collaboration with C. Lindsey (SPRC). With P. Scherrer and the SOI-MDI team at Stanford, we have helped to realize a daily synoptic monitor of far-side activity using medium-resolution MDI images obtained within 24 hours of their acquisition by the SOHO spacecraft. In addition, we have laid out the basic theoretical groundwork for the application of computational seismic holography to the deep solar interior to image the tachocline and underlying radiative core of the Sun. Taking advantage of the substantial depth sensitivity of horizontal-flow diagnostics, we have recently adapted our holographic software to test the basic techniques on the shallow subphotospheres of active regions. The utility of both ground- and space-based instruments is usually enhanced by their combination and comparison. I will present the results of holographic analyses of simultaneous GONG+ prototype and SOI-MDI observations of a large flare-producing active region. The general similarity of the helioseismic images from both instruments is noteworthy. This demonstrates the feasibility of increasing the temporal and spatial coverage available to local analyses by combining SOHO data with that obtained from the GONG+ network. We gratefully acknowledge recent support from the National Science Foundation (AST-9987286) and a contract (PY-0184) from the NASA-funded SOI-MDI project at Stanford University.

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