Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-08-06
Solar Physics (2009), 258, 181-189
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
10 pages, 22 figures, to be published in Solar Physics
Scientific paper
10.1007/s11207-009-9428-4
The purpose of this work is to image solar far-side active regions using acoustic signals with three skips and improve the quality of existing images. The mapping of far-side active regions was first made possible using the helioseismic holography technique by use of four-skip acoustic signals. The quality of far-side images was later improved with the combination of four- and five-skip signals using the time-distance helioseismology technique. In this work, we explore the possibility of making three-skip far-side images of active regions, and improving the image quality by combining the three-skip images with the images obtained from existing techniques. A new method of combining images is proposed that increases the signal-to-noise ratio and reduces the appearance of spurious features.
Hartlep Thomas
Ilonidis Stathis
Zhao Junwei
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