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  Non-Fourier description of heat flux evolution in 3D MHD simulations of the solar corona

Warnecke, J., & Bingert, S. (2020). Non-Fourier description of heat flux evolution in 3D MHD simulations of the solar corona. Geophysical and Astrophysical Fluid Dynamics, 114(1-2), 261-281. doi:10.1080/03091929.2019.1670173.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-68F4-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-68F5-1
Genre: Journal Article

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 Creators:
Warnecke, Jörn1, Author              
Bingert, Sven, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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 Abstract: The hot loop structures in the solar corona can be well modelled by three-dimensional magnetohydrodynamic simulations, where the corona is heated by field line braiding driven at the photosphere. To be able to reproduce the emission comparable to observations, one has to use realistic values for the Spitzer heat conductivity, which puts a large constraint on the time step of these simulations and make them therefore computationally expensive. Here, we present a non-Fourier description of the heat flux evolution, which allows us to speed up the simulations significantly. Together with the semi-relativistic Boris correction, we are able to limit the time step constraint of the Alfvén speed and speed up the simulations even further. We discuss the implementation of these two methods to the Pencil Code  and present their implications on the time step, and the temperature structures, the ohmic heating rate and the emission in simulations of the solar corona. Using a non-Fourier description of the heat flux evolution together with the Boris correction, we can increase the time step of the simulation significantly without moving far away from the reference solution. However, for values of the Alfvén speed limit of 3000km/s and below, the simulation moves away from the reference solution and produces much higher temperatures and much structures with stronger emission.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1080/03091929.2019.1670173
 Degree: -

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Title: Geophysical and Astrophysical Fluid Dynamics
Source Genre: Journal
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Publ. Info: New York : Gordon and Breach Science Publishers.
Pages: - Volume / Issue: 114 (1-2) Sequence Number: - Start / End Page: 261 - 281 Identifier: ISSN: 0309-1929
CoNE: https://pure.mpg.de/cone/journals/resource/958480220815