Imaging Far-Side Solar Active Regions by Use of Time-Distance Helioseismology and Its Validation

Details Imaging Far-Side Solar Active Regions by Use of Time-Distance Helioseismology and Its Validation Imaging Far-Side Solar Active Regions by Use of Time-Distance Helioseismology and Its Validation

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.4606z&link_type=abstract

American Astronomical Society Meeting 210, #46.06; Bulletin of the American Astronomical Society, Vol. 39, p.161

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Helioseismic holography has succeeded in imaging the solar far-side active regions, providing a useful tool for space weather forecast by monitoring large active regions in the back of the Sun. In order to check the robustness of the holography results, as well as to provide another far-side imaging technique, we developed the code to image the far-side of the Sun by use of time-distance helioseismology. In addition to the four-skip acoustic signals that were used by holography analysis, five-skip acoustic signals were also taken into computation in this new time-distance technique. The combination of both far-side images, computed from four-skip and five-skip signals, greatly enhances the picture of active regions, and reduces spurious signals.
To validate our technique of far-side imaging, we performed medium-l numerical simulation of the Sun as a whole sphere, and tested the time-distance far-side imaging technique on this simulated data set. It was found that this technique could successfully identify the location and size of the far-side active regions which typically have a faster interior sound-speed.

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