Statistical mechanics of velocity and magnetic fields in solar active regions

Physics – Condensed Matter – Statistical Mechanics

Scientific paper

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Coronal Loops, Magnetohydrodynamic Turbulence, Solar Activity, Solar Magnetic Field, Solar Velocity, Statistical Mechanics, Distribution Functions, Incompressible Fluids

Scientific paper

A statistical mechanics of the velocity and magnetic fields is formulated for an active region plasma. The plasma subjected to the conservation laws emerges in a most probable state which is described by an equilibrium distribution function containing a Lagrange multiplier for every invariant of the system. The Lagrange multipliers are determined by demanding that the measured expectation values of the invariants be reproduced. For a numerical exercise, some probable values are assumed for these invariants. The total energy of a coronal loop is estimated from energy balance considerations. Doppler widths of the UV and EUV lines excited in the coronal loop plasma give a measure of the root-mean-square velocities. Measurements of magnetic helicity are not available for the solar corona.

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