Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alfv\'en Wave Dissipation in the Solar Chromosphere   Magneto-hydrodynamic (MHD) Alfv\'en waves have been a focus of laboratory
plasma physics and astrophysics for over half a century. Their unique nature
makes them ideal energy transporters, and while the solar atmosphere provides
preferential conditions for their existence, direct detection has proved
difficult as a result of their evolving and dynamic observational signatures.
The viability of Alfv\'en waves as a heating mechanism relies upon the
efficient dissipation and thermalization of the wave energy, with direct
evidence remaining elusive until now. Here we provide the first observational
evidence of Alfv\'en waves heating chromospheric plasma in a sunspot umbra
through the formation of shock fronts. The magnetic field configuration of the
shock environment, alongside the tangential velocity signatures, distinguish
them from conventional umbral flashes. Observed local temperature enhancements
of 5% are consistent with the dissipation of mode-converted Alfv\'en waves
driven by upwardly propagating magneto-acoustic oscillations, providing an
unprecedented insight into the behaviour of Alfv\'en waves in the solar
atmosphere and beyond.

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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: math
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The categories of this paper are: ao-sci