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Alfvén Wave heating of the solar chromosphere : 1.5D models
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Arber, T. D., Brady, Christopher S. and Shelyag, S. (2016) Alfvén Wave heating of the solar chromosphere : 1.5D models. The Astrophysical Journal, 817 (2). 94. doi:10.3847/0004-637X/817/2/94
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Official URL: http://dx.doi.org/10.3847/0004-637X/817/2/94
Abstract
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.
| Item Type: | Journal Article | ||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Solar atmosphere, Solar chromosphere, Magnetohydrodynamics | ||||||||||||||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||||||||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||||||||
| ISSN: | 1538-4357 | ||||||||||||||||||||||||
| Official Date: | 25 January 2016 | ||||||||||||||||||||||||
| Dates: |
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| Volume: | 817 | ||||||||||||||||||||||||
| Number: | 2 | ||||||||||||||||||||||||
| Article Number: | 94 | ||||||||||||||||||||||||
| DOI: | 10.3847/0004-637X/817/2/94 | ||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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