Compressible streaming instabilities of warm multicomponent collisional magnetized astrophysical disks

Details Compressible streaming instabilities of warm multicomponent collisional magnetized astrophysical disks Compressible streaming instabilities of warm multicomponent collisional magnetized astrophysical disks

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phpl...15c2907n&link_type=abstract

Physics of Plasmas, Volume 15, Issue 3, pp. 032907-032907-8 (2008).

Physics

10

Macroinstabilities, Magnetohydrodynamics, Magnetohydrodynamics And Plasmas, Atomic, Molecular, Ion, And Heavy-Particle Collisions, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers

Scientific paper

A general theory for instabilities of multicomponent warm magnetized accretion disks is developed using Maxwell's equations and the equations of motion and continuity for each disk component. The compressibility, anisotropic thermal pressure, and collisions of the charged species with neutrals are taken into account. The thermal effects are involved without any simplifications. An equilibrium state is discussed. The dispersion relation is derived in the most general form for an arbitrary direction of the wave vector of perturbations and for an arbitrary strength of the thermal effects. The solutions of the dispersion relation are found in some specific case appropriated for the weakly ionized plasma in the regions of the protostellar and protoplanetary disks, where the electrons can be considered as thermal and magnetized and the ions and dust grains as cold and unmagnetized. These solutions describe new axisymmetric and nonaxisymmetric electromagnetic disk instabilities due to collisions and the difference between the stationary azimuthal velocities of different charged species.

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