Abstract
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.
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Ilonidis, S., Zhao, J. & Hartlep, T. Time – Distance Solar Far-Side Imaging Using Three-Skip Acoustic Signals. Sol Phys 258, 181–189 (2009). https://doi.org/10.1007/s11207-009-9428-4
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DOI: https://doi.org/10.1007/s11207-009-9428-4