On the minimum temperature of the quiet solar chromosphere

Abstract

aims: We aim to provide an estimate of the minimum temperature of the quiet solar chromosphere. methods: We perform a 2D radiation-MHD simulation spanning the upper convection zone to the lower corona. The simulation includes non-LTE radiative transfer and {an equation-of-state that includes non-equilibrium ionization of hydrogen and non-equilibrium H_2 molecule formation}. We analyze the reliability of the various assumptions made in our model in order to assess the realism of the simulation. results: Our simulation contains pockets of cool gas with down to 1660 K from 1 Mm up to 3.2 Mm height. It overestimates the radiative heating, and contains non-physical heating below 1660 K. Therefore we conclude that cool pockets in the quiet solar chromosphere might have even lower temperatures than in the simulation, provided that there exist areas in the chromosphere without significant magnetic heating. We suggest off-limb molecular spectroscopy to look for such cool pockets and 3D simulations including a local dynamo and a magnetic carpet to investigate Joule heating in the quiet chromosphere.

10 pages, 12 figures, accepted for A&A

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• A solar surface dynamo
• Non-equilibrium hydrogen ionization in 2D simulations of the solar atmosphere
• Solar Carbon Monoxide, Thermal Profiling, and the Abundances of C, O, and their Isotopes
• Strong horizontal photospheric magnetic field in a surface dynamo simulation
• On the minimum temperature of the quiet solar chromosphere
• Inter-network regions of the Sun at millimetre wavelengths
• Generation of electric currents in the chromosphere via neutral-ion drag

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