Generation of electric fields and currents by neutral flows in weakly ionized plasmas through collisional dynamos
MetadataShow full item record
Citation (published version)YS Dimant, MM Oppenheim, AC Fletcher. 2016. "Generation of electric fields and currents by neutral flows in weakly ionized plasmas through collisional dynamos." Physics of Plasmas, Volume 23, Issue 8: 084503 (5).
In weakly ionized plasmas neutral flows drag plasma across magnetic field lines generating intense electric fields and currents. An example occurs in the Earth's ionosphere near the geomagnetic equator. Similar processes take place in the Solar chromosphere and magnetohydrodynamic generators. This paper argues that not all convective neutral flows generate electric fields and currents and it introduces the corresponding universal criterion for their formation, ∇×(U×B)≠∂B/∂t, where U is the neutral flow velocity, B is the magnetic field, and t is time. This criterion does not depend on the conductivity tensor, σˆ. For many systems, the displacement current, ∂B/∂t, is negligible making the criterion even simpler. This theory also shows that the neutral-dynamo driver that generates E-fields and currents plays the same role as the DC electric current plays for the generation of the magnetic field in the Biot-Savart law.
Showing items related by title, author, creator and subject.
Rubin, Shanon J.; Xu, Na; Sandvik, Anders W. (American Physical Society, 2017-05-22)We apply a generalized Kibble-Zurek out-of-equilibrium scaling ansatz to simulated annealing when approaching the spin-glass transition at temperature T=0 of the two-dimensional Ising model with random J=±1 couplings. ...
Kara, V.; Yakhot, V.; Ekinci, K. L. (2017-02-17)We explore the scaling behavior of an unsteady flow that is generated by an oscillating body of finite size in a gas. If the gas is gradually rarefied, the Navier-Stokes equations begin to fail and a kinetic description ...
Xu, Na; Wu, Kai-Hsin; Rubin, Shanon J.; Kao, Ying-Jer; Sandvik, Anders W. (American Physical Society, 2017-11-02)We carry out simulated annealing and employ a generalized Kibble-Zurek scaling hypothesis to study the two-dimensional Ising spin glass with normal-distributed couplings. The system has an equilibrium glass transition at ...