Time-Distance Solar Far-Side Imaging Using Three-Skip Acoustic Signals

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.

10 pages, 22 figures, to be published in Solar Physics

References in corpus (2)

• Time-Distance Imaging of Solar Far-Side Active Regions
• Validating Time-Distance Far-side Imaging of Solar Active Regions through Numerical Simulations

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• Solar wave-field simulation for testing prospects of helioseismic measurements of deep meridional flows
• Imaging individual active regions on the Sun's far side with improved helioseismic holography
• Improved detection of farside solar active regions using deep learning
• Inferring Maps of the Sun's Far-side Unsigned Magnetic Flux from Far-side Helioseismic Images using Machine Learning Techniques
• Verification of the helioseismic Fourier-Legendre analysis for meridional flow measurements
• Green's functions for far-side seismic images: a polar expansion approach
• Performance of solar far-side active regions neural detection
• FarNet-II: An improved solar far-side active region detection method
• Computing Helioseismic Sensitivity Kernels for the Sun's Large-Scale Internal Flows using Global-Scale Wave-Propagation Simulations
• Long-Term Variation of Helioseismic Far-Side Images and What Causes It