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Title: Validating time-distance helioseismology with realistic quiet-sun simulations

Abstract

Linear time-distance helioseismic inversions are carried out for vector flow velocities using travel times measured from two ∼100{sup 2} Mm{sup 2} × 20 Mm realistic magnetohydrodynamic quiet-Sun simulations of about 20 hr. The goal is to test current seismic methods on these state-of-the-art simulations. Using recent three-dimensional inversion schemes, we find that inverted horizontal flow maps correlate well with the simulations in the upper ∼3 Mm of the domains for several filtering schemes, including phase-speed, ridge, and combined phase-speed and ridge measurements. In several cases, however, the velocity amplitudes from the inversions severely underestimate those of the simulations, possibly indicating nonlinearity of the forward problem. We also find that, while near-surface inversions of the vertical velocities are best using phase-speed filters, in almost all other example cases these flows are irretrievable due to noise, suggesting a need for statistical averaging to obtain better inferences.

Authors:
;  [1]
  1. Department of Astronomy, New Mexico State University, 1320 Frenger Mall, Las Cruces, NM 88003 (United States)
Publication Date:
OSTI Identifier:
22356599
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 788; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; DISTANCE; NOISE; NONLINEAR PROBLEMS; OSCILLATIONS; SIMULATION; SUN; SURFACES; THREE-DIMENSIONAL CALCULATIONS; VELOCITY

Citation Formats

DeGrave, K., Jackiewicz, J., and Rempel, M., E-mail: degravek@nmsu.edu, E-mail: jasonj@nmsu.edu, E-mail: rempel@ucar.edu. Validating time-distance helioseismology with realistic quiet-sun simulations. United States: N. p., 2014. Web. doi:10.1088/0004-637X/788/2/127.
DeGrave, K., Jackiewicz, J., & Rempel, M., E-mail: degravek@nmsu.edu, E-mail: jasonj@nmsu.edu, E-mail: rempel@ucar.edu. Validating time-distance helioseismology with realistic quiet-sun simulations. United States. https://doi.org/10.1088/0004-637X/788/2/127
DeGrave, K., Jackiewicz, J., and Rempel, M., E-mail: degravek@nmsu.edu, E-mail: jasonj@nmsu.edu, E-mail: rempel@ucar.edu. 2014. "Validating time-distance helioseismology with realistic quiet-sun simulations". United States. https://doi.org/10.1088/0004-637X/788/2/127.
@article{osti_22356599,
title = {Validating time-distance helioseismology with realistic quiet-sun simulations},
author = {DeGrave, K. and Jackiewicz, J. and Rempel, M., E-mail: degravek@nmsu.edu, E-mail: jasonj@nmsu.edu, E-mail: rempel@ucar.edu},
abstractNote = {Linear time-distance helioseismic inversions are carried out for vector flow velocities using travel times measured from two ∼100{sup 2} Mm{sup 2} × 20 Mm realistic magnetohydrodynamic quiet-Sun simulations of about 20 hr. The goal is to test current seismic methods on these state-of-the-art simulations. Using recent three-dimensional inversion schemes, we find that inverted horizontal flow maps correlate well with the simulations in the upper ∼3 Mm of the domains for several filtering schemes, including phase-speed, ridge, and combined phase-speed and ridge measurements. In several cases, however, the velocity amplitudes from the inversions severely underestimate those of the simulations, possibly indicating nonlinearity of the forward problem. We also find that, while near-surface inversions of the vertical velocities are best using phase-speed filters, in almost all other example cases these flows are irretrievable due to noise, suggesting a need for statistical averaging to obtain better inferences.},
doi = {10.1088/0004-637X/788/2/127},
url = {https://www.osti.gov/biblio/22356599}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 788,
place = {United States},
year = {Fri Jun 20 00:00:00 EDT 2014},
month = {Fri Jun 20 00:00:00 EDT 2014}
}