The differential emission measure of nested hot and cool magnetic loops

Physics

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Magnetic Field Configurations, Solar Magnetic Field, Solar Temperature, Solar Transition Region, Thermophysical Properties, Magnetohydrodynamics, Solar Corona, Thermal Stability

Scientific paper

The detailed thermal structure of the magnetized solar transition region, as measured by its differential emission measure (DEM(T)), is poorly known. Building on the fact that the solar surface is strongly magnetized and thereby structured, proposals have been made that envision a significant lower-temperature contribution to the energy balance from (ion) heat flux across an arcade of different temperature loops. In this paper, we describe a self-consistent 2D MHD simulation, which includes the full thermal effects of parallel stability and anisotropic conduction, of a nested-loop model of the thermal and magnetic structure of the transition region. We then demonstrate that the predicted DEM agrees with observations in the conceptually elusive T less than 10 exp 5 K regime.

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