SSC Seminar Series: Acoustic Sources on the Solar Surface
Wednesday, December 07, 2022 - 3:00pm to 4:00pm
Viewing party in Morse Hall rm 301 OR Zoom
Speaker: Dr. Shah Mohammad Bahauddin
Laboratory of Atmospheric and Space Physics, University of Colorado Boulder
Full title: The Quest for finding Acoustic Sources on the Solar Surface: the DKIST era
Abstract: The solar acoustic oscillations are likely stochastically excited by convective dynamics in the solar photosphere, though few direct observations of individual source events have been made and their detailed characteristics are still unknown. Wave source identification requires measurements that can reliably discriminate the local wave signal from the background convective motions and resonant modal power. This is quite challenging as these ‘noise’ contributions have amplitudes several orders of magnitude greater than the sources and the propagating wave fields they induce. In this talk, I will discuss how we can resolve these sources in simulated photospheres and in observation as well. The development of this technique leveraged the application of deep learning algorithm as well as the upcoming Daniel K. Inouye Solar Telescope (DKIST)’s high-resolution, fast cadence capabilities. Using the filtering technique developed, we have uncovered previously unknown properties of the acoustic emission process and their possible characteristic dynamics both in below (upper convection zone) and above (chromosphere/corona) atmosphere. We believe the technique will have important applications in chromospheric wave-studies and may lead to new investigations in high-resolution local-helioseismology.
Schedule: Check out the rest of this season's Space Science Seminar Series, as well as previous recordings.