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Three-dimensional simulations of the inhomogeneous low solar wind
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Magyar, N. and Nakariakov, V. M. (Valery M.) (2021) Three-dimensional simulations of the inhomogeneous low solar wind. The Astrophysical Journal, 907 (1). 55. doi:10.3847/1538-4357/abd02f ISSN 0004-637X.
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Official URL: https://doi.org/10.3847/1538-4357/abd02f
Abstract
In the near future, the Parker Solar Probe will put theories about the dynamics and nature of the transition between the solar corona and the solar wind to stringent tests. The most popular mechanism aimed to explain the dynamics of the nascent solar wind, including its heating and acceleration, is magnetohydrodynamic (MHD) turbulence. Most of the previous models focused on nonlinear cascade induced by interactions of outgoing Alfvén waves and their reflections, ignoring effects that might be related to perpendicular structuring of the solar coronal plasma, despite overwhelming evidence for it. In this paper, for the first time, we analyze through 3D MHD numerical simulations the dynamics of the perpendicularly structured solar corona and solar wind, from the low corona to 15 R ⊙. We find that background structuring has a strong effect on the evolution of MHD turbulence, on much faster timescales than in the perpendicularly homogeneous case. On timescales shorter than nonlinear times, linear effects related to phase mixing result in a 1/f perpendicular energy spectrum. As the turbulent cascade develops, we observe a perpendicular (parallel) energy spectrum with a power-law index of −3/2 or −5/3 (−2), a steeper perpendicular magnetic field than velocity spectrum, and a strong build-up of negative residual energy. We conclude that the turbulence is most probably generated by the self-cascade of the driven transverse kink waves, referred to previously as "uniturbulence," which might represent the dominant nonlinear energy cascade channel in the pristine solar wind.
Item Type: | Journal Article | ||||||
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Alternative Title: | |||||||
Subjects: | Q Science > QB Astronomy Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Solar wind -- Mathematical models, Inhomogeneous materials, Three-dimensional imaging -- Mathematical models, Solar atmosphere | ||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||
ISSN: | 0004-637X | ||||||
Official Date: | 28 January 2021 | ||||||
Dates: |
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Volume: | 907 | ||||||
Number: | 1 | ||||||
Article Number: | 55 | ||||||
DOI: | 10.3847/1538-4357/abd02f | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Reuse Statement (publisher, data, author rights): | This is an author-created, un-copyedited version of an article accepted for publication in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.3847/1538-4357/abd02f | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Copyright Holders: | © 2021. The American Astronomical Society. All rights reserved | ||||||
Date of first compliant deposit: | 4 December 2020 | ||||||
Date of first compliant Open Access: | 28 January 2022 | ||||||
Related URLs: | |||||||
Open Access Version: |
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