Heating of coronal plasma by anomalous current dissipation

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Electric Current, Magnetic Flux, Plasma Heating, Plasma-Electromagnetic Interaction, Solar Corona, Solar Magnetic Field, Convective Heat Transfer, Electric Fields, Loops, Ohmic Dissipation, Photosphere, Plasma Sheaths, Toroidal Plasmas

Scientific paper

It is shown that there exist heating mechanisms which connect the observed radiative properties of the inner corona in a simple way to the underlying solar magnetic field. The mechanisms considered involve the generation and consequent dissipation of coronal currents. It is argued that the spatially and temporally inhomogeneous nature of the erupting solar magnetic field is an essential element of coronal heating. Unlike heating theories conceived in the context of the 'homogeneous' corona, this class of current heating models incorporates the observed stochastic coronal structuring at the onset, and does not view it as a complication of an otherwise straightforward model. Attention is given to the generation of coronal currents, the flux-tube emergence, the gradual growth and decay of active regions, the energetics of current dissipation, current sheath geometry and heat transport, and anomalous current dissipation.

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