Acceleration of Plasma Flows in the Solar Atmosphere Due to Magnetofluid Coupling - Simulation and Analysis

Abstract

Within the framework of a two-fluid description possible pathways for the generation of fast flows (dynamical as well as steady) in the lower solar atmosphere is established. It is shown that a primary plasma flow (locally sub-Alfvénic) is accelerated when interacting with emerging/ambient arcade--like closed field structures. The acceleration implies a conversion of thermal and field energies to kinetic energy of the flow. The time-scale for creating reasonably fast flows ($\gtrsim 100$ km/s) is dictated by the initial ion skin depth while the amplification of the flow depends on local $\beta$. It is shown, for the first time, that distances over which the flows become "fast" are $\sim 0.01R_s$ from the interaction surface; later the fast flow localizes (with dimensions $\lesssim 0.05R_S$) in the upper central region of the original arcade. For fixed initial temperature the final speed ($\gtrsim 500km/s$) of the accelerated flow, and the modification of the field structure are independent of the time-duration (life-time) of the initial flow. In the presence of dissipation, these flows are likely to play a fundamental role in the heating of the finely structured Solar atmosphere.

arXiv comment33 pages with 10 figures, submitted to The Astrophys. J

References in corpus (8)

• Magnetic properties of photospheric regions having very low magnetic flux
• Direct simulations of helical Hall-MHD turbulence and dynamo action
• Magneto-Fluid Coupling - Eruptive Events in the Solar Corona
• Formation and Primary Heating of The Solar Corona - Theory and Simulation
• Observational Evidence for Small-Scale Mixture of Weak and Strong Fields in the Quiet Sun
• Acceleration of Plasma Flows Due to Reverse Dynamo Mechanism
• Generation of Flows in the Solar Chromosphere Due to Magnetofluid Coupling
• Shocks in the Quiet Solar Photosphere: A Rather Common Occurrence

Cited by in corpus (8)

• Mechanisms for Multi-Scale Structures in Dense Degenerate Astrophysical Plasmas
• Beltrami-Bernoulli Equilibria in Plasmas with Degenerate Electrons
• On the Relaxed States in the Mixture of Degenerate and Non-Degenerate Hot Plasmas of Astrophysical Objects
• Dynamical fast flow generation/acceleration in dense degenerate two-fluid plasmas of astrophysical objects
• Macro-scale fast flow and magnetic field generation in 2-temperature relativistic electron-ion plasmas of astrophysical objects
• Mechanism for flow generation/acceleration in dense degenerate stellar atmospheres
• On the quadruple Beltrami fields in thermally relativistic electron-positron-ion plasma
• Thermo-magneto coupling in a dipole plasma