Local Helioseismology and Modeling of Impulsive Events

POSTER

Abstract

Helioseismology investigates the Sun's interior through oscillation observations, and is composed of both local and global studies. Global helioseismology focuses on global mode oscillations of the Sun, which can be observed by effects on the surface. Local helioseismology focuses on the effects of these oscillations to the background state of the Sun, including time-dependent characteristics which help us understand the structure and processes of the solar interior. We propose a model to simulate the effects of impulsive events (so-called sunquakes) on pressure and density, as well as helioseismic waves that travel through the Sun's interior. We are able to decompose the governing equations into one dimension, and then reconstruct solutions in 3D using spherical harmonics. Since the bulk of computation is spent on solving the differential equations, performing these calculations in 1D greatly reduces computational cost. Additionally, we employ non-reflecting boundary conditions at the solar surface to more accurately describe how acoustic waves travel in the Sun. By comparing simulations to data obtained from the Solar Dynamics Observatory (SDO), etc., we hope to identify the source height (or depth) of sunquakes and perhaps even the mechanism of excitation.

Authors

  • John Stefan

    New Jersey Inst of Tech

  • Debbie Andres

    Department of Applied Physics and Department of Physics, Columbia University, Istituto Italiano di Tecnologia, Graphene Labs, Italy, Department of Physics and Astronomy, Purdue University, Department of Electrical Engineering, Princeton University, Department of Applied Physics and Applied Mathematics, Columbia University, NJIT, New Jersey Inst of Technology, New Jersey Inst of Tech, New Jersey Institute of Technology, Center for Advanced Radiation Sources, University of Chicago, High Pressure Science and Technology Advanced Research, State University of New York at Stony Brook, Rutgers University, NIST, Brookhaven National Laboratory, University of Chicago, University of South Florida, ETH Zurich, Max Planck POSTECH/Korea Research Initiative, University of Virginia, Rutgers University - Camden, New Jersey Institute of technology, Shaanxi Normal University, Pohang Science and Technology University, Sungkyunkwan University, Northern Illinois University and Argonne National Laboratory, Beijing National Laboratory for Condensed Matter Physics , and Institute of Physics, Chinese Academy of Sciences, Rutgers U., Orsova Engineers, U.S. Naval Research Laboratory, Center for Space Science and Engineering Research, Virginia Tech, Virginia., Princeton University, NASA Goddard Space Flight Center, Villanova University, SOFIA/USRA, Jet Propulsion Laboratory, Hudson Regional Health Commision, Rutgers University, College of William & Mary, Department of Physics, Drexel University, Drexel University, Drexel Universty, University of Massachusetts Amherst, Pohang Institue of Science and Technology, Indiana University - Purdue University Indianapolis, Department of Physics, University of Maryland, Naval Research Laboratory, Towson Univ, Rice University, Independence Blue Cross Cardiovascular Research Center, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, Department of Physics, Temple University, PulseTorr LLC, Department of Chemistry, West Chester University, Department of Physics, West Chester University, College of William and Mary Dept. of Physics, University of Virginia Dept. of Materials Science and Engineering, United States Naval Academy, Rutgers The State University of New Jersey, Univ of Maryland-College Park, Los Alamos National Laboratory, POSTECH, New Jersey Institute of Technology, Department of Electrical and Computer Engineering, HamSCI/ARRL, Virginia Tech, Rutgers University-Camden, University of Washington, Rutgers, The State University of New Jersey