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  Validating Forward Modeling and Inversions of Helioseismic Holography Measurements

DeGrave, K., Braun, D. C., Birch, A., Crouch, A. D., & Javornik, B. (2018). Validating Forward Modeling and Inversions of Helioseismic Holography Measurements. The Astrophysical Journal, 863(1): 34. doi:10.3847/1538-4357/aacffd.

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Genre: Journal Article

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 Creators:
DeGrave, K., Author
Braun, D. C., Author
Birch, Aaron1, Author              
Crouch, A. D., Author
Javornik, B., Author
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: methods: observational; Sun: helioseismology; Sun: interior; Sun: oscillations
 Abstract: Here, we use synthetic data to explore the performance of forward models and inverse methods for helioseismic holography. Specifically, this work presents the first comprehensive test of inverse modeling for flows using lateral-vantage (deep-focus) holography. We derive sensitivity functions in the Born approximation. We then use these sensitivity functions in a series of forward models and inversions of flows from a publicly available magnetohydrodynamic quiet-Sun simulation. The forward travel times computed using the kernels generally compare favorably with measurements obtained by applying holography, in a lateral-vantage configuration, on a 15 hr time series of artificial Dopplergrams extracted from the simulation. Inversions for the horizontal flow components are able to reproduce the flows in the upper 3 Mm of the domain, but are compromised by noise at greater depths.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/aacffd
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 863 (1) Sequence Number: 34 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3