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Simulations of Alfvén and Kink wave driving of the solar chromosphere : efficient heating and spicule launching
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Brady, Christopher S. and Arber, T. D. (2016) Simulations of Alfvén and Kink wave driving of the solar chromosphere : efficient heating and spicule launching. Astrophysical Journal, 829 (2). 80. doi:10.3847/0004-637X/829/2/80 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.3847/0004-637X/829/2/80
Abstract
Two of the central problems in our understanding of the solar chromosphere are how the upper chromosphere is heated and what drives spicules. Estimates of the required chromospheric heating, based on radiative and conductive losses, suggest a rate of ~0.1 erg cm−3 s−1 in the lower chromosphere and drops to ~10−3 erg cm−3 s−1 in the upper chromosphere. The chromosphere is also permeated by spicules, higher density plasma from the lower atmosphere propelled upwards at speeds of ~10–20 km s−1, for so-called Type I spicules, which reach heights of ~3000–5000 km above the photosphere. A clearer understanding of chromospheric dynamics, its heating, and the formation of spicules is thus of central importance to solar atmospheric science. For over 30 years it has been proposed that photospheric driving of MHD waves may be responsible for both heating and spicule formation. This paper presents results from a high-resolution MHD treatment of photospheric driven Alfvén and kink waves propagating upwards into an expanding flux tube embedded in a model chromospheric atmosphere. We show that the ponderomotive coupling from Alfvén and kink waves into slow modes generates shocks, which both heat the upper chromosphere and drive spicules. These simulations show that wave driving of the solar chromosphere can give a local heating rate that matches observations and drive spicules consistent with Type I observations all within a single coherent model.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Solar chromosphere , Solar photosphere, Magnetohydrodynamic waves | ||||||||
Journal or Publication Title: | Astrophysical Journal | ||||||||
Publisher: | IOP Publishing | ||||||||
ISSN: | 0004-637X | ||||||||
Official Date: | 23 September 2016 | ||||||||
Dates: |
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Volume: | 829 | ||||||||
Number: | 2 | ||||||||
Article Number: | 80 | ||||||||
DOI: | 10.3847/0004-637X/829/2/80 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 26 August 2016 | ||||||||
Date of first compliant Open Access: | 1 November 2016 | ||||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC) | ||||||||
Grant number: | ST/K001590/1, ST/H008861/1, ST/H00887X/1, ST/K00333X/1 (STFC) | ||||||||
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