Validation of Far-side Imaging of Solar Active Regions through Numerical Simulations

Details Validation of Far-side Imaging of Solar Active Regions through Numerical Simulations Validation of Far-side Imaging of Solar Active Regions through Numerical Simulations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh32a0790h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH32A-0790

Computer Science

Sound

7522 Helioseismology

Scientific paper

Helioseismology provides important tools for understanding the solar interior as well as for space weather forecast. Using observation data from instruments such as MDI (Michelson Doppler Imager) aboard the SOHO (Solar and Heliospheric Observatory) spacecraft, helioseismic inferences have tremendously advanced our knowledge and understanding of the interior structure and dynamics of the Sun. In general, the methods used for analyzing observations are based on simplified models of wave propagation such as ray or Born approximation, but have not been validated by more sophisticated models or numerical simulations. Here, we evaluate one technique, far-side imaging of solar active region by time-distance helioseismology, by using artificial oscillation data derived from numerical simulations of wave propagation in the Sun. The simulations are performed for the full spherical Sun. Active regions are modeled by locally modifying the speed of sound. We evaluate the performance of the far-side imaging technique by varying the size and location of the artificial active region, and analyse the appearance of ghost images and artifacts. This research is supported by NASA's Living with a Star program. The support ot the NASA Postdoctoral Program administered by Oak Ridge Associated Universities is gratefully acknowledged. Simulations have been performed on the Columbia Supercomputer at NASA Ames Research Center.

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