Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640312s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #403.12
Astronomy and Astrophysics
Astronomy
Scientific paper
The heating of the solar chromosphere by strongly damped Alfvén waves that produce heating through plasma-neutral collisions is studied by solving analytically a one-dimensional model of the self-consistent plasma-neutral-electromagnetic system. We compute the vertical profile of the wave power by a novel method, including the damping effect neglected in previous treatments, and find that the high-frequency portion of the source power spectrum is strongly damped at the lower altitudes, depositing heat there, whereas the lower-frequency perturbations are nearly undamped and can be observed in the corona and above. As a result, the power and spectrum of the waves observed above the corona is only a fraction of those at the photosphere and, contrary to earlier supposition, does not represent the energy input. We show, using the parameters of a semi-empirical model for quiet-Sun conditions, that this mechanism can generate sufficient heat to account for the radiative losses in the chromosphere, with most of the heat deposited as required at lower altitudes.
Song Paul
Vasyliūnas Vytenis M.
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