Minimum Dissiative Relaxed States: Applied to Magnetic Field Structurs of Laboratory Plasmas & Solar Corona
by
Bramhananda Dasgupta(Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville)
→
Europe/Stockholm
122:026
122:026
Description
The conventional theory of plasma relaxation based on the selective decay of the magnetic energy over the global helicity predicts a force-free state of plasma. Inspite of extensive application of such force-free states to different cases of laboratory and astrophysical plasmas, such states with zero pressure gradient are often inadequate to describe a large number of realistic plasma systems. In this talk, we describe an an alternative approach to plasma relaxation, based on an well-known principle of irreversible thermodynamics, the principle of minimum entropy production, which is equivalent to the principle of minimum dissipation rate (MDR) of energy. The relaxed or self-organized states thus obtained are non-force free and hence are more suitable for describing the realistic plasma systems. We describe the applications of this non-force free states of the plasma to various laboratory devices and solar coronal magnetic field.