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Observation of Transient Wavefields through DKIST: Dawn of Ultrahigh-Resolution Source Wavefield Local Helioseismology

Presentation #201.02 in the session Heliosiesmology.

Published onSep 18, 2023
Observation of Transient Wavefields through DKIST: Dawn of Ultrahigh-Resolution Source Wavefield Local Helioseismology

A Doppler-image time series of the solar photosphere shows large amplitude fluctuations associated with granulation, structured magnetic fields, and p-mode oscillations. When sufficiently well resolved, it also shows, with much lower amplitudes, transient fluctuations due to magneto-hydrodynamic waves and shocks. For spatially compact and temporally discrete acoustic wave sources, these transients can be identified against the high amplitude background fluctuations because they occur on time scales short (cs > 7 km/s) compared to the evolutionary time of the granulation, magnetic fields, or p-mode coherence. Extraction of the acoustic transient signal from an observed time-series thus requires observations with: adequate spatial resolution (Δx < 30 km), high temporal cadence (Δt < 4 s), and sufficient local signal to noise (SNR > 1). The Daniel K. Inouye Solar Telescope (DKIST) will have these observational capabilities and will be able to resolve these perturbations with details. Indeed, compelling evidence showcasing the ubiquitous presence of wavefields has been reported by DKIST observations. In this work, we report the potential to establish quantifiable relationships between wavefront properties, source depth, and atmospheric properties, and provide explicit demonstrations of an inversion algorithm that effectively utilizes source wavefield characteristics to obtain ultrahigh-resolution local helioseismology. Through the implementation of this inversion scheme, we have successfully extracted the line-of-sight velocity, horizontal velocity, and pressure profile with depth in the simulated photospheres. Notably, these parameters were previously unattainable by inversion, even at lower resolutions, but our algorithm has made their extraction possible. With the remarkable capabilities of DKIST, these state-of-the-art algorithms will provide us unprecedented insights into the dynamics and phenomena of the Sun’s interior.

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