Magnetorotational instability in plasmas with mobile dust grains

Ren, Haijun; Cao, Jintao; Li, Ding; Chu, Paul K.
March 2013
Physics of Plasmas;Mar2013, Vol. 20 Issue 3, p032102
Academic Journal
The magnetorotational instability of dusty plasmas is investigated using the multi-fluid model and the general dispersion relation is derived based on local approximation. The dust grains are found to play an important role in the dispersion relation in the low-frequency mode and exhibit destabilizing effects on the plasma. Both the instability criterion and growth rate are affected significantly by the dust and when the dust is heavy enough to be unperturbed, the reduced dispersion relations are obtained. The instability criteria show that the dust grains have stabilizing effects on the instability when the rotation frequency decreases outwards and conversely lead to destabilizing effects when the rotation frequency increases outwards. The results are relevant to accession and protoplanetary disks.


Related Articles

  • Nonlinear dust drift Alfvén waves in rotating planetary magnetospheres. Haque, Q.; Saleem, H. // Physics of Plasmas;Oct2006, Vol. 13 Issue 10, p102901 

    Linear and nonlinear electromagnetic waves are investigated in the dusty magnetospheres of rotating planets. In the presence of heavy dust, the plasma may support very low frequency waves that can be affected by the plasma rotation. It is also shown that Alfvén waves can couple with the...

  • Nonlinearly coupled inertial Alfve´n and dust acoustic waves in complex plasmas. Shukla, P. K.; Stenflo, L. // Physics of Plasmas;Aug2001, Vol. 8 Issue 8 

    The nonlinear coupling between finite amplitude inertial Alfve´n (IA) and dust acoustic (DA) waves in a complex plasma is considered. By employing a multi-fluid dusty plasma model, which includes the effects of the ponderomotive force on the DA waves, a system of coupled equations is derived...

  • Effect of dust charge fluctuation on the Alfve´n wave propagation in a magnetized dusty plasma. Alam, Md. Khurshed; Begum, Bilkis Ara; Chowdhury, A. Roy // Physics of Plasmas;Oct2001, Vol. 8 Issue 10 

    Growth rates of propagating waves in a magnetized dusty plasma are studied for various values of natural decay rate for the presence of dust charge fluctuation in the case of hot ions and electrons and for a weak magnetic field. The dispersion relation is obtained for the waves that propagate...

  • Structure and Instabilities of Irradiated Protoplanetary Disks: Effects of Dust Particle Growth. Nomura, Hideko // Astrophysics & Space Science;2004, Vol. 292 Issue 1-4, p435 

    We have constructed self-consistent temperature and density profiles of irradiated active protoplanetary disks, using a two-dimensional radiative transfer calculation. By means of these profiles we have studied the stabilization of the convective instability by radiative heating and the...

  • Magnetohydrodynamic simulation of the protoplanetary disk of the Sun. Kolesnichenko, A. V.; Marov, M. Ya. // Solar System Research;Sep2009, Vol. 43 Issue 5, p410 

    In the framework of the basic cosmogony problem related with the reconstruction of the solar protoplanetary disk at the early stages of its existence, a closed system of magnetohydrodynamic equations with the scale of average motion is formulated in the approximation of single-fluid magnetic...

  • Can grain growth explain transition disks? Birnstiel, T.; Andrews, S. M.; Ercolano, B. // Astronomy & Astrophysics / Astronomie et Astrophysique;Aug2012, Vol. 544 Issue 2, pA79-1 

    Aims. Grain growth has been suggested as one possible explanation for the diminished dust optical depths in the inner regions of protoplanetary "transition" disks. In this work, we directly test this hypothesis in the context of current models of grain growth and transport. Methods. A set of...

  • Magnetohydrodynamics of dusty plasmas. Shukla, P.K.; Rahman, H.U. // Physics of Plasmas;Jan1996, Vol. 3 Issue 1, p430 

    Derives a set of magnetohydrodynamic (MHD) equations for multi-component dusty plasmas by assuming that the characteristic wave frequency is much smaller than the ion gyrofrequency. Linear dispersion relation; Coupling between dust-Alfven, dust-magnetosonic, and dust-whistler waves; Dust inertia.

  • A three-fluid system of equations describing dusty magnetoplasmas with dynamically important dust and ion components. Schro¨er, A.; Kopp, A. // Physics of Plasmas;Aug2000, Vol. 7 Issue 8 

    In this work a closed set of differential equations is derived which allows for the description of multifluid plasmas consisting of electrons, ions, and electrically charged dust particles. An additional neutral gas component has been omitted here for clarity. The main feature of this set of...

  • Instability of shear waves in an inhomogeneous strongly coupled dusty plasma. Mishra, Amruta; Kaw, P. K.; Sen, A. // Physics of Plasmas;Aug2000, Vol. 7 Issue 8 

    It is demonstrated that low frequency shear modes in a strongly coupled, inhomogeneous, dusty plasma can grow on account of an instability involving the dynamical charge fluctuations of the dust grains. The instability is driven by the gradient of the equilibrium dust charge density and is...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics