On the thermal stability of hot coronal loops - The coupling between chromosphere and corona

Physics

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Chromosphere, Coronal Loops, Plasma Interactions, Solar Corona, Thermal Stability, Thermodynamic Coupling, High Temperature Plasmas, Hydrodynamic Equations, Magnetohydrodynamic Flow, Plasma Density, Plasma Temperature, Solar Magnetic Field, Solar Physics, Time Dependence

Scientific paper

We consider the interaction of the hot plasma in coronal loops with the underlying chromospheric plasma, and find stable static equilibria if the coupling between corona and chromosphere is sufficiently strong. However, for typical coronal loop conditions the interaction is not strong enough for perfect stabilisation and an oscillatory solution is found with a period of about a day. The latter solution is very similar to the static solution during most of the time and is relatively cool only during a short while. We tentatively identify this cyclic behaviour with the observed up-flows and downflows in the solar corona.

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