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Energy in density gradient View all abstracts by submitter

J. Vranjes   Submitted: 2015-10-30 06:46

Inhomogeneous plasmas and fluids contain energy stored in inhomogeneity and they naturally tend to relax into lower energy states by developing instabilities or by diffusion. But the actual amount of energy in such inhomogeneities has remained unknown. In the present work the amount of energy stored in a density gradient is calculated for several specific density profiles in a cylindric configuration. This is of practical importance for drift wave instability in various plasmas, and in particular in its application in models dealing with the heating of solar corona because the instability is accompanied with stochastic heating, so the energy contained in inhomogeneity is effectively transformed into heat. It is shown that even for a rather moderate increase of the density at the axis in magnetic structures in the corona by a factor 1.5 or 3, the amount of excess energy per unit volume stored in such a density gradient becomes several orders of magnitude greater than the amount of total energy losses per unit volume (per second) in quiet regions in the corona. Consequently, within the life-time of a magnetic structure such energy losses can easily be compensated by the stochastic drift wave heating.

Authors: J. Vranjes, M. Kono
Projects: None

Publication Status: Phys. Plasmas 22, 012105 (2015)
Last Modified: 2015-11-02 10:52
Go to main E-Print page  Particle acceleration in 3D single current sheets formed in the solar corona and heliosphere: PIC approach  Alfven wave coupled with flow-driven fluid instability in interpenetrating plasmas  Edit Entry  Download Preprint  Delete Entry 

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