Authors: Savannah Perez-Piel (Space Sciences Laboratory, University of California Berkeley), Juan Camilo Buitrago-Casas (Space Sciences Laboratory, University of California Berkeley), Juan Carlos Martínez Oliveros (Space Sciences Laboratory, University of California Berkeley), Charles Lindsey (Northwest Research Associates)

We present a comprehensive helioseismological study that reveals compelling evidence of a submerged source of acoustic power located two thousand kilometers beneath the sun’s photosphere. Sunquakes, traditionally associated with high-energy near-surface events such as solar flares, manifest as observable Doppler ripples on the solar photosphere. By constructing depth-time maps at frequencies of 4, 6, 8, and 10 MHz, we visualize the presence of this compact source and establish the absence of correlation between the observed seismic activity and the flaring event. Interestingly, our findings may suggest that a portion of sunquakes can originate at a significant depth through a photospheric activity-related mechanism, separate from surface tremors. This study extends and strengthens our ongoing investigation into helioseismic holography as a powerful tool for studying sunquakes and their associated submerged sources of acoustic power. Building upon this confirmation, we delve into the statistical relevancy, instilling confidence in our methodology. Furthermore, we present preliminary results aiming to verify these submerged sources using higher-cadence Dopplergrams, pushing the Nyquist limit and enhancing our time resolution. These results further validate the existence of submerged sources and provide crucial insights into their characteristics. Our study not only expands the current understanding of sunquakes but also opens up new avenues for future research in helioseismology and related fields.