Alfvén wave heating of the solar chromosphere: 1.5D models

Arber, T. D., Brady, C. S. and Shelyag, S. 2016, Alfvén wave heating of the solar chromosphere: 1.5D models, Astrophysical journal, vol. 817, no. 2, doi: 10.3847/0004-637X/817/2/94.

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Title Alfvén wave heating of the solar chromosphere: 1.5D models
Author(s) Arber, T. D.
Brady, C. S.
Shelyag, S.ORCID iD for Shelyag, S.
Journal name Astrophysical journal
Volume number 817
Issue number 2
Total pages 9
Publisher IOP Publishing
Place of publication Bristol, Eng.
Publication date 2016-02
ISSN 0004-637X
Keyword(s) Science & Technology
Physical Sciences
Astronomy & Astrophysics
magnetohydrodynamics (MHD)
Sun: chromosphere
Summary © 2016. The American Astronomical Society. All rights reserved.. Physical processes that may lead to solar chromospheric heating are analyzed using high-resolution 1.5D non-ideal MHD modeling. We demonstrate that it is possible to heat the chromospheric plasma by direct resistive dissipation of high-frequency Alfvén waves through Pedersen resistivity. However, this is unlikely to be sufficient to balance radiative and conductive losses unless unrealistic field strengths or photospheric velocities are used. The precise heating profile is determined by the input driving spectrum, since in 1.5D there is no possibility of Alfvén wave turbulence. The inclusion of the Hall term does not affect the heating rates. If plasma compressibility is taken into account, shocks are produced through the ponderomotive coupling of Alfvén waves to slow modes and shock heating dominates the resistive dissipation. In 1.5D shock coalescence amplifies the effects of shocks, and for compressible simulations with realistic driver spectra, the heating rate exceeds that required to match radiative and conductive losses. Thus, while the heating rates for these 1.5D simulations are an overestimate, they do show that ponderomotive coupling of Alfvén waves to sound waves is more important in chromospheric heating than Pedersen dissipation through ion-neutral collisions.
Language eng
DOI 10.3847/0004-637X/817/2/94
Field of Research 0201 Astronomical And Space Sciences
0305 Organic Chemistry
0306 Physical Chemistry (Incl. Structural)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2016, The American Astronomical Society
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