Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp22a..05g&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP22A-05
Other
7509 Corona, 7546 Transition Region, 7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection, 7859 Transport Processes
Scientific paper
A simple magnetohydrodynamic (MHD) model of a fully ionized, collision dominated plasma that includes the electrical conductivity and thermoelectric tensors in Ohm's law is used to generate current sheet solutions that, where the assumption of full ionization is valid, are characterized by ranges of temperature, density, magnetic field strength, and flow speed that correspond to those of the transition region and corona. The electrical conductivity and thermoelectric tensors are functions of temperature, number density, and magnetic field strength. The model contains a prescribed sheared magnetic field with a characteristic length scale L. The characteristic sheet width is 2L, but the temperature has transition region or coronal values only within a central plasma sheet (CPS) that has a width one or more orders of magnitude smaller than 2L. The CPS is essentially the diffusion region. The heating rate per unit mass, and the flow speed in the CPS are orders of magnitude larger, and the density is orders of magnitude smaller than in the surrounding plasma. The heating rate per unit volume is a maximum in the CPS, and falls off steadily outside the CPS. The heating is driven almost entirely by the convection electric field. The current density and heating rate each consist of a thermoelectric component driven by the temperature gradient, and a conduction component driven by the center of mass electric field. These components largely cancel one another, yielding a total current density and heating rate that are orders of magnitude smaller than either of their components. This suggests that thermoelectric effects are important in determing current sheet structure. This work was supported by NSF grant ATM-0242820 to the Institute for Scientific Research.
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