Signatures of emerging subsurface structures in the sun
T. Hartlep, A. G. Kosovichev, J. Zhao, N. N. Mansour

TL;DR
This study explores whether acoustic power observations can detect subsurface structures indicative of emerging active regions on the sun before they become visible on the surface, using simulations and real data analysis.
Contribution
It demonstrates how acoustic power variations relate to subsurface wavespeed perturbations, advancing methods for early detection of solar active regions.
Findings
Acoustic power depends on wavespeed perturbation sign, depth, and strength.
Simulations show detectable acoustic signatures of subsurface structures.
Analysis of SOHO/MDI data supports simulation results.
Abstract
The complex dynamics that lead to the emergence of active regions on the sun are poorly understood. One possibility is that magnetic structures (flux tubes, etc.) rise from below the surface by self induction and convection that lead to the formation of active regions and sunspots on the solar surface. For space weather forecasting, one would like to detect the subsurface structures before they reach the surface. The goal of this study is to investigate whether sound speed perturbations associated with subsurface structures could affect the acoustic power observed at the solar surface above them. Possible mechanisms for this effect are wave reflection, scattering or diffraction. By using numerical simulations of wave propagation in the solar interior, we investigate whether observations of the acoustic power can be used to detect emerging active regions before they appear on the…
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Taxonomy
TopicsSolar and Space Plasma Dynamics · Astro and Planetary Science · Planetary Science and Exploration
